Article
Chemistry, Physical
Priya Maheshwari, Debarati Bhattacharya, P. K. Pujari
Summary: Ultrathin bilayers of Cu/Nb were deposited on Si substrate using DC and RF magnetron sputtering, with structural characterization and defect depth profiling carried out using X-ray reflectivity and a positron accelerator, respectively. Results indicate that the defect microstructure of the layers is influenced by thickness, deposition method, and irradiation, with RF sputtered layers exhibiting more defects compared to DC sputtered layers. Positron depth profiling did not show distinct interfaces between the metallic layers or between the layer and the substrate. Systematic characterization of defects in ultrathin structures is crucial to understanding the correlation between defect microstructure and properties of nanolayer composites for advanced applications.
SURFACES AND INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Sofia Caspani, Suellen Moraes, David Navas, Mariana P. Proenca, Ricardo Magalhaes, Claudia Nunes, Joao Pedro Araujo, Celia T. Sousa
Summary: In this study, multi-segmented bilayered Fe/Cu nanowires were fabricated through electrodeposition in porous anodic alumina membranes, with micromagnetic simulations used to evaluate their magnetic properties. The number of Fe/Cu bilayers and the length of Fe segments were found to affect the magnetic properties of the nanostructures, with Fe segments of different lengths exhibiting different magnetic structures.
Article
Materials Science, Multidisciplinary
N. O. Antropov, E. A. Kravtsov, M. V. Makarova, V. V. Proglyado, T. Keller, I. A. Subbotin, E. M. Pashaev, G. V. Prutskov, A. L. Vasiliev, Yu. M. Chesnokov, N. G. Bebenin, M. A. Milyaev, V. V. Ustinov, B. Keimer, Yu. N. Khaydukov
Summary: Research shows that by adjusting the exchange coupling in the structure, spin-flop transition (SFT) can be achieved in artificial ferrimagnets (FEMs) without the need for magnetic anisotropy. In experimental Fe-Gd FEMs, the transition field was successfully lowered by two orders of magnitude using Pd spacers.
Article
Physics, Multidisciplinary
Na Li, Jin Tang, Lei Su, Ya-Jiao Ke, Wei Zhang, Zong-Kai Xie, Rui Sun, Xiang-Qun Zhang, Wei He, Zhao-Hua Cheng
Summary: The study investigates the ultrafast spin dynamics of an antiferromagnet in a ferromagnet/antiferromagnet heterostructure using an all-optical method. It demonstrates that optical modification of interfacial exchange coupling between Fe and GdFeO3 efficiently excites terahertz spin dynamics, and the excitation efficiency can be significantly modified via the pump laser influence.
Article
Chemistry, Physical
F. Djeffal, N. Martin, H. Ferhati, A. Benhaya
Summary: In this study, high-performance SnOx band-selective photodetectors were fabricated using the reactive gas pulsing process. The fabricated PDs demonstrated high UV photodetection capabilities and multispectral response. It was also found that the oxygen pulsing time could modulate the optoelectronic properties of the film, enhancing the sensitivity and responsivity of the photodetectors.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Charalampos Sakkas, Jean-Marc Cote, Joseph Gavoille, Jean-Yves Rauch, Pierre-Henri Cornuault, Anna Krystianiak, Olivier Heintz, Nicolas Martin
Summary: Titanium-boron-nitrogen (Ti-B-N) thin films were deposited using RF reactive magnetron sputtering in an argon + nitrogen mixture. The introduction time of nitrogen gas was varied to change the boron and nitrogen concentrations in the films, leading to changes in their electronic transport properties. The boron and nitrogen contents showed a reverse evolution as a function of the nitrogen pulsing parameters.
Article
Materials Science, Multidisciplinary
S. A. Raza, M. A. Correa, D. E. Gonzalez-Chavez, F. Bohn, R. L. Sommer
Summary: In this study, the quasi-static and dynamic magnetic properties of exchange-biased Co2FeAl/IrMn nanostructures were investigated, revealing the influence of antiferromagnet thickness on the dynamic magnetic response. The experimental tunability of the dynamic magnetic response by varying IrMn thickness and the angle between external and bias fields was demonstrated, highlighting the potential applications of exchange-biased Co2FeAl/IrMn nanostructures in high-frequency magnetization dynamics.
Article
Physics, Applied
Xingxing Zhan, Ying Zhang, Xiaohong Yan, Yang Xiao
Summary: Bright and dark magnon modes of an exchange-coupled ferromagnetic bilayer were studied, revealing that the occurrence of a dark mode requires equal frequencies for the two magnon modes, while the dark magnon mode is determined by both magnon frequencies and the strengths of magnon-photon and direct magnon-magnon coupling when direct magnon-magnon coupling is present. These results may be beneficial for future cavity magnonic experiments involving ferromagnetic bilayers.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Physical
Saroj Kumar Jha, Monika Sharma, Nitin K. Puri, Bijoy K. Kuanr
Summary: The effect of oxygen growth-pressure on the structural and magnetic properties of epitaxial YIG thin films was investigated. Increasing oxygen pressure during growth led to smoother films and enhanced saturation magnetization. The lowest Gilbert damping was achieved for YIG film deposited under 0.15 mbar oxygen pressure.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Xin Zhang, Yale Zhang, Songwei Wang, Shenglong Deng, Siqian Liu, Qisheng Lin, Huaiying Zhou, Jingtai Zhao, Guanghui Rao
Summary: Single-phase samples of TmCr1-xFexO3 (x = 0-1) were prepared through solid state reactions, showing paramagnetic to canted anti-ferromagnetic phase transition for x = 0-0.6. The increasing doping content x leads to a monotonic increase in T-N, with T-N increasing from 126 K to 343 K as x increases from 0 to 0.6. This change is attributed to the increased angle of Cr/Fe-O(4c)-Cr/Fe.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Physics, Applied
Yuzan Xiong, Jerad Inman, Zhengyi Li, Kaile Xie, Rao Bidthanapally, Joseph Sklenar, Peng Li, Steven Louis, Vasyl Tyberkevych, Hongwei Qu, Zhili Xiao, Wai K. Kwok, Valentine Novosad, Yi Li, Fusheng Ma, Wei Zhang
Summary: This study experimentally demonstrated a tunable magnetically induced transparency (MIT) effect in the YIG/Py magnon-magnon coupled system by changing magnetic field orientations. The observed mode hybridization between Py and YIG was identified, with a tunable coupling strength observed under an oblique magnetic field orientation. Geometrical considerations of magnetization under the oblique magnetic field were used to interpret the findings.
PHYSICAL REVIEW APPLIED
(2022)
Article
Chemistry, Physical
Zhu-bai Li, Zhen Zhang, Yuan-zhe Fu, Chao Wang, Lei Wei, Suo Bai
Summary: This work presents a method of preparing composite (Nd,Dy)-Fe-B magnets to enhance coercivity with a slight decrease in remanence. The addition of Dy-Fe-B powders improves the coercivity of sintered magnets. The coexistence of Dy-Fe-B and Nd2Fe14B phases in the magnets leads to an increase in the fluctuation field and a decrease in the domain wall size, resulting in significant improvement in coercivity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Electrical & Electronic
Sergey A. Odintsov, Abdulkarim A. Amirov, Alexandr P. Kamantsev, Andrey A. Grachev, Valeriya V. Rodionova, Alexandr Sadovnikov
Summary: In this study, the controllable spin-wave propagation in the yttrium iron garnet stripe with an Fe-Rh slab was investigated using experimental and numerical methods. The results showed that the geometry variation and design of the Fe-Rh slab significantly influenced spin-wave propagation. The position and geometric parameters of the Fe-Rh slab affected the static internal magnetic field profile in the yttrium iron garnet. Additionally, micromagnetic simulation demonstrated the possibility of width mode filtering for a surface magnetostatic spin wave.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Article
Physics, Multidisciplinary
Zhikun Xie, Jielin Zhou, Yuanhai Cai, Jipei Chen, Wei Zhang, Jun Peng, Zhifeng Chen
Summary: The laser-induced magnetization dynamics in a perpendicularly exchange-coupled TbFeCo/GdFeCo bilayer film were studied using pump-probe magneto-optical Kerr spectroscopy. An ultrafast modulation effect on local magnetization orientation was observed in the GdFeCo layer, triggered by the femtosecond laser pulse and driven by the effective exchange field within a timescale of hundreds of picoseconds. These processes demonstrate field- and fluence-dependent dynamical behaviors and propose an atomistic Heisenberg model for studying the laser-induced magnetization dynamics through micromagnetic simulation.
FRONTIERS IN PHYSICS
(2021)
Article
Physics, Condensed Matter
Manu Mohan, Sanjib Nayak, Arnab Pal, P. Murugavel
Summary: Fe-substituted SmCrO3 samples were prepared by solid-state route to explore their intriguing magnetic properties, including the coexistence of ferromagnetic and antiferromagnetic ordering at different cationic sites, as well as the negative magnetization, controllable magnetization switching behavior, and remarkable exchange bias effect.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Multidisciplinary Sciences
Kai Wagner, Andrew Smith, Toni Hache, Jen-Ru Chen, Liu Yang, Eric Montoya, Katrin Schultheiss, Juergen Lindner, Juergen Fassbender, Ilya Krivorotov, Helmut Schultheiss
SCIENTIFIC REPORTS
(2018)
Article
Nanoscience & Nanotechnology
Christopher Safranski, Eric A. Montoya, Ilya N. Krivorotov
NATURE NANOTECHNOLOGY
(2019)
Article
Multidisciplinary Sciences
Eric Arturo Montoya, Salvatore Perna, Yu-Jin Chen, Jordan A. Katine, Massimiliano d'Aquino, Claudio Serpico, Ilya N. Krivorotov
NATURE COMMUNICATIONS
(2019)
Article
Physics, Applied
Parinaz Sadri-Moshkenani, Mohammad Wahiduzzaman Khan, Md Shafiqul Islam, Eric Montoya, Ilya Krivorotov, Nader Bagherzadeh, Ozdal Boyraz
APPLIED PHYSICS LETTERS
(2020)
Article
Multidisciplinary Sciences
Eric Arturo Montoya, Jen-Ru Chen, Randy Ngelale, Han Kyu Lee, Hsin-Wei Tseng, Lei Wan, En Yang, Patrick Braganca, Ozdal Boyraz, Nader Bagherzadeh, Mikael Nilsson, Ilya N. Krivorotov
SCIENTIFIC REPORTS
(2020)
Article
Physics, Multidisciplinary
P. Omelchenko, E. Montoya, E. Girt, B. Heinrich
JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS
(2020)
Article
Physics, Multidisciplinary
Jen-Ru Chen, Andrew Smith, Eric A. Montoya, Jia G. Lu, Ilya N. Krivorotov
COMMUNICATIONS PHYSICS
(2020)
Article
Engineering, Electrical & Electronic
Parinaz Sadri-Moshkenani, Mohammad Wahiduzzaman Khan, Md Shafiqul Islam, Eric Arturo Montoya, Ilya Krivorotov, Ozdal Boyraz
Summary: An opto-electronic method is proposed for reading the memory state in spin transfer torque random access memory (STT-RAM) cells, where theoretical modeling suggests a significant enhancement in the voltage change due to state change of each memory cell through plasmonic effects.
IEEE JOURNAL OF QUANTUM ELECTRONICS
(2021)
Article
Physics, Multidisciplinary
Pavlo Omelchenko, Eric Arturo Montoya, Erol Girt, Bret Heinrich
Summary: The study explores asymmetric transport of pure-spin currents across an interface of dissimilar nonmagnetic materials Au/Pt. Experimental results demonstrate that transmission of pure-spin current from Au into Pt is twice as efficient as from Pt into Au. The findings are interpreted by extending conventional spin-pumping, spin-diffusion theory to include boundary conditions of reflected and transmitted spin current at the Au/Pt interface that are proportional to the established spin chemical potentials on either side of the interface.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Applied
Pavlo Omelchenko, Elliot Wadge, Juliana Besler, Erol Girt, Bret Heinrich
Summary: In this paper, a continuous model analogous to the discrete atomic model commonly used in magnetometry studies is presented. The continuous model is shown to be almost indistinguishable from the discrete counterpart, validating its use for data analysis. Additionally, a simple analytic expression is found that approximately solves the continuous model and provides insight into the behavior of the magnetic moment within the magnetic structure. The main advantage of the continuous model is its faster computational speed and more rapid data analysis compared to the energy minimization required for the discrete model.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Multidisciplinary
Rodolfo Rodriguez, Shirash Regmi, Hantao Zhang, Wei Yuan, Pavlo Makushko, Eric A. Montoya, Ihor Veremchuk, Rene Hubner, Denys Makarov, Jing Shi, Ran Cheng, Igor Barsukov
Summary: This study demonstrates the existence of significant interfacial spin transport in a hybrid antiferromagnet/ferromagnet system, consisting of Cr2O3 and permalloy, which remains stable up to room temperature. The analysis of experimental data shows that interfacial magnon pumping plays an important role in signal generation.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Andrew Smith, Kemal Sobotkiewich, Amanatullah Khan, Eric A. Montoya, Liu Yang, Zheng Duan, Tobias Schneider, Kilian Lenz, Juergen Lindner, Kyongmo An, Xiaoqin Li, Ilya N. Krivorotov
Article
Materials Science, Multidisciplinary
Eric Montoya, Pavlo Omelchenko, Chris Coutts, Nicholas R. Lee-Hone, Rene Huebner, David Broun, Bret Heinrich, Erol Girt