Article
Chemistry, Physical
V. G. Myagkov, L. E. Bykova, V. S. Zhigalov, A. A. Matsynin, S. M. Zharkov, A. A. Ivanenko, G. N. Bondarenko, D. A. Velikanov
Summary: We report the formation of epitaxial D03-Fe3Rh(001) films grown during solid-state reaction in Rh/Fe(001) bilayers on MgO(001) substrates. A new ordered phase, in addition to the B2-FeRh phase, was formed in Fe68Rh32 composition above 400 degrees C. The new phase is identified as the D03-Fe3Rh(001) phase, exhibiting a cube-on-cube orientation relationship with the MgO(001) substrate. The D03-Fe3Rh sample possesses high saturation magnetization and is a soft magnetic material.
Article
Materials Science, Multidisciplinary
Jia Xu, Mengwen Jia, Chao Zhou, Qian Li, Padraic Shafer, Gong Chen, Mengmeng Yang, Alpha T. N'Diaye, Elke Arenholz, Ziqiang Qiu, Yizheng Wu
Summary: The spin Hall magnetoresistance (SMR) effect in single-crystalline Pt/CoO(001) bilayers has been systematically investigated. X-ray magnetic linear dichroism measurements prove that CoO antiferromagnetic (AFM) spins can be switched into the direction orthogonal to the applied field. We find that the SMR signal is composed of two components related to either the switching of CoO AFM Neel order or the applied strong field effect. Both SMR components show a positive angular dependence. The observed positive SMR is mainly attributed to the uncompensated spins at the Pt/CoO interface.
Article
Materials Science, Multidisciplinary
Anup Kumar Bera, Sadhana Singh, Md. Shahid Jamal, Zainab Hussain, V. Raghavendra Reddy, Dileep Kumar
Summary: Fe film growth on Ag(001) substrate was studied using reflection high energy electron diffraction and magneto-optical Kerr effect. Epitaxial growth of Fe film on Ag surface and epitaxial island formation up to 1 nm thickness was observed. Ion beam sculpting induced uniaxial magnetic anisotropy, leading to multiple-step jump in magnetic hysteresis loops.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Jian Mao, Zhi Heng Yao, Xu Zhang, Jijun Yun, Meixia Chang, Yalu Zuo, Li Xi
Summary: This study investigated the spin-pumping and spin-orbit torque efficiencies in ferromagnetic/heavy metal bilayers, revealing the influence of different crystallographic directions on the anisotropic spin current absorption and spin-orbit torques in epitaxial Pt(111) layer. The results from ferromagnetic resonance and harmonic Hall resistance measurement techniques provided insights into the spin current transmission efficiency and anisotropic spin Hall effect of the epitaxial Pt(111) layer.
Article
Materials Science, Multidisciplinary
M. Sbroscia, A. Verna, G. Stefani, S. R. Vaidya, R. Moroni, F. Bisio, S. Iacobucci, F. Offi, S. Simonucci, A. Ruocco, R. Gotter
Summary: Angle resolved-Auger photoelectron coincidence spectroscopy (AR-APECS) was used to investigate electron correlation in the exchange-coupling at the ferromagnetic/antiferromagnetic interface of a Fe/CoO bilayer on Ag(001). The effective correlation energy U-eff was experimentally determined for different orbital and spin combinations, revealing enhanced Coulomb interaction for the e(g) orbital and exchange interaction for the t(2g) orbital in the Fe/CoO interface compared to the Fe/Ag case.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Polymer Science
Sandrine Kamdoum Noukelag, Maxwell Mewa-Ngongang, Siphelo Ngqoloda, Lebogang Kotsedi, Lovasoa Christine Razanamahandry, Seteno K. O. Ntwampe, Christopher J. Arendse, Malik Maaza
Summary: This study reports on the development of two efficient synthesis methods for Fe-Ag nanoparticles and their characterization. The results show that the green Ag/Fe2O3 NPs successfully inhibited the growth of various spoilage microorganisms.
JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS
(2023)
Article
Instruments & Instrumentation
M. Slezak, H. Nayyef, P. Drozdz, W. Janus, E. Swierkosz, M. Szpytma, M. Zajac, A. Koziol-Rachwal, T. Slezak
Summary: We investigated the magnetic properties of epitaxial CoO(111)/Fe(110) and NiO(111)/Fe(110) bilayers by combining X-ray magnetic linear and circular dichroism with magnetooptic Kerr effect measurements. Our results show that in both cases, the ferromagnetic sublayer plays a dominant role and determines the magnetic state of the neighboring antiferromagnet, although different interaction scenarios are observed. In CoO/Fe bilayers, the antiferromagnetic spins are frozen and their orientation is imprinted by the magnetization of the Fe layer. On the other hand, in NiO/Fe bilayers, the antiferromagnetic spins are rotatable and always follow the reorientation of the Fe magnetization.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2023)
Article
Materials Science, Multidisciplinary
M. Yang, Q. Li, T. Wang, B. Hong, C. Klewe, Z. Li, X. Huang, P. Shafer, F. Zhang, C. Hwang, W. S. Yan, R. Ramesh, W. S. Zhao, Y. Z. Wu, Xixiang Zhang, Z. Q. Qiu
Summary: This study investigates the mechanism of current-induced switching of antiferromagnetic (AFM) order using measurements of Hall resistance and x-ray magnetic linear dichroism. The researchers identified both magnetic and nonmagnetic contributions to the current-induced changes and quantitatively determined the percentage of spin switching. They also found that the thermal effect on CoO magnetic switching varies with the film structure.
Article
Chemistry, Physical
Peijiao Fang, Baiwei Wang, C. P. Mulligan, T. M. Murray, S. Khare, Daniel Gall
Summary: In this study, tungsten carbide films were sputter-deposited onto Mg0(001) substrates at 400 degrees C in Ar - CH4 gas mixtures. The films were found to contain amorphous carbon and carbon vacancies. The epitaxial relationship between the cubic WCy phase layers and the substrate was demonstrated through X-ray diffraction and transmission electron microscopy analyses.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
M. Yang, Q. Li, A. T. N'Diaye, P. Shafer, C. Klewe, T. Y. Wang, Y. Z. Wu, Xixiang Zhang, C. Hwang, Z. Q. Qiu
Summary: Using XMCD and XMLD measurements, this study determined the spin orientations of Ni, CoO and Fe films in Ni/CoO/Fe films grown on a curved MgO(001) substrate. The results showed that the vicinal surface of the substrate caused a spin canting towards the out-of-plane direction in the Ni and CoO films due to interfacial coupling. The spin canting angle increased with the vicinal angle and this relationship was quantitatively determined. This research provides a new pathway for tailoring spin orientation in thin-film based spintronic devices by modifying the substrate surface symmetry in combination with ferromagnetic/antiferromagnetic interfacial interaction.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
M. Slezak, P. Drozdz, W. Janus, M. Szpytma, H. Nayyef, A. Koziol-Rachwal, M. Zajac, T. Slezak
Summary: In this study, exchange bias and interfacial antiferromagnetic spin orientation in epitaxial CoO(111)/Fe(110) bilayers were investigated. Experimental results revealed that exchange bias occurs in the zero-field-cooled system and is influenced by the in-plane magnetic state of the Fe(110) sublayer and the uniaxial magnetic anisotropy of the Fe layer. The specific magnetic state chosen for the Fe sublayer can determine the axis and direction of interfacial antiferromagnetic spins after the sample is cooled.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Physics, Applied
T. Kawagoe, S. Suga
Summary: The growth of thin Pd films on Au(001) surfaces has been investigated. The films were found to grow epitaxially with noticeable lattice expansion on the Au(001) surface, and annealing improves the surface morphology. This three-step method enables quasi-layer-by-layer growth.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Baiwei Wang, Poomirat Nawarat, Kim Michelle Lewis, Panos Patsalas, Daniel Gall
Summary: The optical transmission and reflection spectra of Ti1-xMgxN(001) layers were studied, showing a linear reduction in free carrier density with increasing Mg content x. Nitrogen vacancies in Mg-rich samples act as donors, resulting in a minimum free carrier density of 1.6 x 10(22) cm(-3) for x = 0.49. The materials have potential as refractory infrared plasmonic materials.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
J. C. Moreno H, R. Ponce-Perez, Gregorio H. Cocoletzi, Noboru Takeuchi
Summary: Spin polarized first principles calculations were used to study the properties of MnN deposited on the CrN surface. Results suggest a transition of Mn from paramagnetic to ferromagnetic, with the first layer of CrN switching from antiferromagnetic to ferromagnetic alignment. This work identifies a potential antiferromagnetic system for spintronics applications.
APPLIED SURFACE SCIENCE
(2022)
Article
Physics, Applied
Yu Miao, Tong Li, Xiaorui Chen, Cunxu Gao, Desheng Xue
Summary: The angular-dependent magnetoresistance (ADMR) of an epitaxial Fe(001) film is studied at different temperatures, with the current along the in-plane hard and easy axes. The temperature dependence of ordinary magnetoresistance (OMR), anisotropic magnetoresistance (AMR), and magnetocrystalline anisotropy magnetoresistance (MMR) in ADMR is determined. The findings of OMR, AMR, and MMR in Fe(001) ADMR are of great significance in understanding magnetoresistance in magnetic films.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Physics, Multidisciplinary
E. Golias, I Kumberg, I Gelen, S. Thakur, J. Goerdes, R. Hosseinifar, Q. Guillet, S. Sharma, C. Schuessler-Langeheine, N. Pontius, W. Kuch, K. Dewhurst
Summary: The study provides evidence for an ultrafast optically induced ferromagnetic alignment of antiferromagnetic Mn in Co/Mn multilayers. The transient ferromagnetic signal is observed at the arrival of the pump pulse at the Mn L-3 resonance, indicating a timescale comparable to the excitation duration. Theoretical calculations suggest that the emergence of this transient ferromagnetic state is due to the imbalanced population of Mn unoccupied states caused by the Co interface.
PHYSICAL REVIEW LETTERS
(2021)
Review
Chemistry, Multidisciplinary
Lalminthang Kipgen, Matthias Bernien, Felix Tuczek, Wolfgang Kuch
Summary: This article summarizes the research on spin-crossover molecules on solid surfaces in molecular spintronics, covering a range from single molecules to ultrathin films, mainly in the sub-10 nm range. The achievements, challenges, and prospects in this field are highlighted.
ADVANCED MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Radu Abrudan, Martin Hennecke, Florin Radu, Torsten Kachel, Karsten Holldack, Rolf Mitzner, Andreas Donges, Sergii Khmelevskyi, Andras Deak, Laszlo Szunyogh, Ulrich Nowak, Stefan Eisebitt, Ilie Radu
Summary: Experimental and theoretical evidence demonstrates the existence of element-specific magnetic damping parameters in the ultrafast magnetization response of a high-anisotropy ferrimagnetic DyCo5 alloy to femtosecond laser excitation. The significantly different demagnetization and remagnetization dynamics of Dy and Co magnetic moments are linked to their element-specific spin-orbit coupling strengths. These findings can be utilized for tuning the speed and magnitude of laser-driven magnetic processes in multicomponent magnetic materials.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2021)
Article
Chemistry, Physical
Sangeeta Thakur, Evangelos Golias, Ivar Kumberg, Kuppusamy Senthil Kumar, Rahil Hosseinifar, Jorge Torres-Rodriguez, Lalminthang Kipgen, Christian Lotze, Lucas M. Arruda, Chen Luo, Florin Radu, Mario Ruben, Wolfgang Kuch
Summary: The study focuses on the role of molecule-substrate interactions in the spin-state switching characteristics of surface-bound thin films of SCO complexes. The submonolayer coverage of the complex exhibits a mixed spin-state, showcasing the impact of molecular interactions on thermal switching. The efficiency of light-induced spin switching suggests potential for light-addressable molecular devices based on SCO complexes.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Materials Science, Multidisciplinary
Tauqir Shinwari, Ismet Gelen, Yasser A. Shokr, Ivar Kumberg, Ikramullah, Muhammad Sajjad, Wolfgang Kuch, M. Yaqoob Khan
Summary: The experiments demonstrate that introducing defects in the bulk of the antiferromagnetic layer enhances the exchange bias and blocking temperature, while defects at the interface do not have the same effect. Furthermore, it is observed that deeper insertion of defects results in higher exchange bias field values and larger coercivity.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Sofia O. Parreiras, Daniel Moreno, Borja Cirera, Miguel A. Valbuena, Jose I. Urgel, Markos Paradinas, Mirco Panighel, Fernando Ajejas, Miguel A. Nino, Jose M. Gallego, Manuel Valvidares, Pierluigi Gargiani, Wolfgang Kuch, Jose I. Martinez, Aitor Mugarza, Julio Camarero, Rodolfo Miranda, Paolo Perna, David Ecija
Summary: The study investigates the electronic and magnetic properties of Dy-carboxylate metal-organic networks on Cu(111), revealing that surface-supported metal-organic coordination can alter the orientation of the easy magnetization axis of Dy coordinative centers and enhance magnetic anisotropy significantly. This opens up new possibilities to customize the magnetic anisotropy and magnetic moments of lanthanide elements on surfaces.
Correction
Chemistry, Multidisciplinary
Lalminthang Kipgen, Matthias Bernien, Felix Tuczek, Wolfgang Kuch
ADVANCED MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Rahil Hosseinifar, Evangelos Golias, Ivar Kumberg, Quentin Guillet, Karl Frischmuth, Sangeeta Thakur, Mario Fix, Manfred Albrecht, Florian Kronast, Wolfgang Kuch
Summary: In this study, we investigated the all-optical magnetic toggle switching of a ferrimagnetic Gd26Fe74 film using X-ray magnetic circular dichroism photoelectron emission microscopy. We found that the sample magnetization can be reversed by linearly polarized laser pulses above a certain threshold fluence, independent of the magnetization direction. However, there are local deviations from this deterministic behavior near magnetic domain walls, which can be attributed to extrinsic effects and the magnetic domain structure of the sample.
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
Abdulhakim Bake, Md Rezoanur Rahman, Peter J. Evans, Michael Cortie, Mitchell Nancarrow, Radu Abrudan, Florin Radu, Yury Khaydukov, Grace Causer, Karen L. Livesey, Sara Callori, David R. G. Mitchell, Zeljko Pastuovic, Xiaolin Wang, David Cortie
Summary: This article presents datasets of electron microscopy, polarised neutron reflectometry, and magnetometry for ultra-small cobalt particles in titania thin films. The provided data can assist in the development of advanced fitting algorithms for magnetization gradients in thin films.
Article
Chemistry, Multidisciplinary
Cristina Martin-Fuentes, Sofia O. Parreiras, Jose Urgel, Victor Rubio-Gimenez, Beatriz Muniz Cano, Daniel Moreno, Koen Lauwaet, Manuel Valvidares, Miguel A. Valbuena, Pierluigi Gargiani, Wolfgang Kuch, Julio Camarero, Jose M. Gallego, Rodolfo Miranda, Jose Martinez, Carlos Marti-Gastaldo, David Ecija
Summary: This study presents a unique network design of Co-HOTP metal-organic architecture with large orbital magnetic moments and magnetic anisotropy, which is achieved by designing a one-atom-thick structure on a Au(111) surface. Experimental techniques combined with theoretical simulations confirm the antiferromagnetic ground state of this material.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Nanoscience & Nanotechnology
David Gandia, Lourdes Marcano, Lucia Gandarias, Danny Villanueva, Inaki Orue, Radu Marius Abrudan, Sergio Valencia, Irati Rodrigo, Jose Angel Garcia, Alicia Muela, Ma Luisa Fdez-Gubieda, Javier Alonso
Summary: The influence of culture medium on the structural, morphological, and magnetic characteristics of Magnetospirillum magneticum AMB-1 magnetosome chains has been investigated. The introduction of Co ions in the MSGM + W bacteria affects the magnetic response and increases coercivity and remanence. The heating efficiency of these bacteria is also influenced by the culture medium, with MSGM - W bacteria being the most efficient below 35 mT, and FSM and MSGM + W bacteria being the most efficient above 60 mT, reaching a maximum SAR of 12 W g(-1).
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Physics, Condensed Matter
Tauqir Shinwari, Ismet Gelen, Melek Villanueva, Ivar Kumberg, Yasser A. Shokr, M. Yaqoob Khan, Wolfgang Kuch
Summary: Single-crystalline antiferromagnetic artificially layered [Ni/Mn] films of different thicknesses, covered by ferromagnetic Co layers, show decreased perpendicular interatomic lattice distance compared to disordered Ni x Mn 100-x alloy films. The artificially layered [Ni/Mn] films exhibit higher coercivity and exchange bias, which is attributed to a stronger interlayer exchange coupling caused by the ordered buckling in the samples.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Jan Grunwald, Jorge Torres, Axel Buchholz, Christian Naether, Lea Kaemmerer, Manuel Gruber, Sebastian Rohlf, Sangeeta Thakur, Heiko Wende, Winfried Plass, Wolfgang Kuch, Felix Tuczek
Summary: The article reports a compound with unprecedented properties, which can maintain its high-spin state at high temperatures for a long period of time under light irradiation. The researchers attribute this behavior to the large structural difference between the two spin states and the four distortion coordinates associated with the spin transition, which drastically reduce the relaxation rate of the metastable high-spin state. These findings open up new strategies for developing compounds that exhibit light-induced excited spin state trapping (LIESST) at high temperatures, potentially around room temperature.
Article
Materials Science, Multidisciplinary
Alexei Nefedov, Chun Li, Kai Mueller, Anemar Bruno Kanj, Lars Heinke, Chen Luo, Kai Chen, Florin Radu, Evangelos Golias, Wolfgang Kuch, Christof Woell
Summary: Metal-organic frameworks (MOFs) are crystalline and porous, molecular solids consisting of metal nodes and organic ligands. In this study, the magnetic properties of two SURMOF-2 systems (Cu(bdc) and Cu(bpdc)) were investigated using x-ray magnetic circular dichroism. The presence of the ferromagnetic phase in these SURMOF-2 systems was confirmed. The magnetic behavior of the guest molecules differed from that of the host matrix after loading.
Article
Chemistry, Physical
Alina Manzoor, Aamir Shahzad, Wolfgang Kuch, Tauqir Shinwari, Ivar Kumberg, Yasser A. Shokr, Muhammad Azhar Khan
Summary: The addition of holmium was found to modify the magnetic and electrical properties of lithium-nickel soft ferrites, as well as the Curie temperature required for high-frequency applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
