Review
Nanoscience & Nanotechnology
Hui-Chuan Liu, Si-Ming Zeng, Rui Li, Yan-Ping Jiang, Qiu-Xiang Liu, Xin-Gui Tang
Summary: The study demonstrated bipolar resistive switching and ferroelectricities of Ni0.5Zn0.5Fe2O4 (NZFO) thin films using Au/NZFO/LNO/Si structure. It was found that annealing atmosphere influences the structure and properties of NZFO, with oxygen vacancy and strain stress playing a significant role. The saturation magnetization and remnant polarization values of the samples were affected by the annealing atmosphere, with improved resistive switching property observed in NZFO annealed in nitrogen atmosphere.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2021)
Article
Multidisciplinary Sciences
Michael Grimes, Hiroki Ueda, Dmitry Ozerov, Federico Pressacco, Sergii Parchenko, Andreas Apseros, Markus Scholz, Yuya Kubota, Tadashi Togashi, Yoshikazu Tanaka, Laura Heyderman, Thomas Thomson, Valerio Scagnoli
Summary: Understanding the ultrashort time scale structural dynamics of the FeRh metamagnetic phase transition is crucial for explaining the mechanism driving the evolution from an antiferromagnetic to ferromagnetic state. Using an X-ray free electron laser, researchers observed the time evolution of the (-101) lattice diffraction peak with sub-ps resolution following laser excitation. The dynamics at higher laser fluence indicate the presence of a transient lattice state different from the high temperature ferromagnetic phase. By comparing lattice temperatures, the electron-phonon coupling in FeRh thin films as a function of laser excitation fluence is estimated.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Physical
Aleksei S. Komlev, Dmitriy Y. Karpenkov, Dmitry A. Kiselev, Tatiana S. Ilina, Alisa Chirkova, Radel R. Gimaev, Takamasa Usami, Tomoyasu Taniyama, Vladimir Zverev, Nikolai S. Perov
Summary: This study comprehensively characterized the nucleation and evolution of the ferromagnetic phase in the thin Fe49Rh51 film on a MgO substrate near the antiferromagnetic (AFM) to ferromagnetic (FM) phase transition, utilizing measurements of temperature, time, and magnetic field dependencies. The observed relaxation processes of magnetization indicate the nucleation of the FM phase on the film surface and its growth towards the film-substrate interface. The confirmation of FM phase growth evolution was verified through vibrational magnetometry and magnetic force microscopy methods.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
Surya Narayan Panda, Sudip Majumder, Samiran Choudhury, Arpan Bhattacharya, Sumona Sinha, Anjan Barman
Summary: This study investigates the magnetization dynamics in graphene/ferromagnet hybrid heterostructures and reveals an inverse relationship between ultrafast demagnetization time and Gilbert damping parameter, induced by interfacial spin accumulation and pure spin-current transport. The findings can contribute to the understanding of magnetic damping and aid in the design of graphene-based ultrahigh-speed spintronic devices.
Article
Nanoscience & Nanotechnology
Cory D. Cress, Darshana Wickramaratne, Matthew R. Rosenberger, Zachariah Hennighausen, Patrick G. Callahan, Samuel W. LaGasse, Noam Bernstein, Olaf M. van 't Erve, Berend T. Jonker, Syed B. Qadri, Joseph C. Prestigiacomo, Marc Currie, Igor I. Mazin, Steven P. Bennett
Summary: In this work, we demonstrate the direct writing of nanoscale magnetic ordering patterns in FeRh films using focused helium-ion beam irradiation. By characterizing the changes in magnetic order induced by He+ irradiation, as well as quantifying strain- and defect-induced alterations in spin-flip energy, we show promise for the development of in-plane AF-FM spintronic devices. This approach may reduce the complexity of fabrication processes and eliminate interfacial polarization losses in such devices.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Materials Science, Multidisciplinary
E. Schmoranzerova, T. Ostatnicky, J. Kimak, D. Kriegner, H. Reichlova, R. Schlitz, A. Badura, Z. Soban, M. Muenzenberg, G. Jakob, E-J Guo, M. Klaeui, P. Nemec
Summary: We observed a giant quadratic magneto-optical effect in a 50 nm thick YIG layer. Through theoretical and experimental methods, we quantified both linear and quadratic magneto-optical effects in the studied material. The quadratic magneto-optical signal in the thin YIG film exceeded the linear response, reaching values of 450 grads that are comparable with Heusler alloys or ferromagnetic semiconductors. This enhancement is attributed to antiferromagnetic coupling of two Fe sublattices. We also found that the choice of experimental conditions, particularly the wavelength, is crucial for optimizing the quadratic magneto-optical effect.
Article
Chemistry, Physical
Sehwan Song, Jiwoong Kim, Jisung Lee, Hyegyeong Kim, Noboru Miyata, Neeraj Kumar, Y. Soh, Jae Hyuck Jang, Chanyong Hwang, Brian J. Kirby, Sungkyun Park
Summary: FeRh thin films exhibit unexpected ferromagnetic characteristics at low temperatures, which is different from their bulk state. The coexistence of antiferromagnetic and residual ferromagnetic states leads to thermomagnetic irreversibility and negative magnetoresistance. Polarized neutron reflectometry reveals the presence of non-uniform ferromagnetic states at the interfaces, with the bottom region correlated to structural distortion and the top region originating from non-stoichiometry.
APPLIED SURFACE SCIENCE
(2023)
Review
Nanoscience & Nanotechnology
Zemin Zhang, Wooyeon Kim, Min Jae Ko, Yuelong Li
Summary: Perovskite single-crystal thin films (SCTFs) are a significant research hotspot in the field of optoelectronic devices due to their low defect state density, long carrier diffusion length, and high environmental stability. However, the large-area and high-throughput preparation of perovskite SCTFs faces challenges in reducing surface defects and manufacturing high-performance devices. This review focuses on the development of large-area, controlled thickness, and high-quality perovskite SCTFs, including the mechanism and key factors affecting the nucleation and crystallization process, methods of preparation, surface engineering, applications in various devices, and opportunities and challenges in commercialization.
Article
Physics, Applied
Rohit Medwal, Angshuman Deka, Joseph Vimal Vas, Martial Duchamp, Hironori Asada, Surbhi Gupta, Yasuhiro Fukuma, Rajdeep Singh Rawat
Summary: This research demonstrates the growth-induced magneto-crystalline anisotropy in 40 nm epitaxial YIG thin films, enabling directional control over the generation and propagation of magnons. Ferromagnetic resonance measurements reveal the presence of cubic and non-cubic anisotropy in epitaxial YIG thin films.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Inorganic & Nuclear
Xu Ying, Zhenhua Zhu, Chen Zhao, Yi-Quan Zhang, Jinkui Tang
Summary: A five-coordinate mononuclear Dy(III) complex with a C4v geometry was designed and synthesized. The complex exhibits a large anisotropy barrier in the absence of a dc magnetic field, which is attributed to the strong interaction between the phenolate and Dy(III) ion. Ab initio calculations suggest that the most likely relaxation pathway occurs through the second excited state. The terminal SMe group offers the potential for deposition on the Au surface through a strong Au-S bond.
INORGANIC CHEMISTRY
(2022)
Article
Crystallography
Qingyun Li, Honghu Zhang, Houbin Zhu, Hui Hu
Summary: In this study, single-crystal lithium niobate thin films (LNOI) were prepared by two methods and their lattice properties were studied using HRXRD and confocal Raman spectroscopy. The results showed a regular crystal lattice arrangement of the LNOIs and their electrical performance parameters were close to LN bulk material, providing useful information for LNOI fabrication and photonic devices.
Article
Engineering, Electrical & Electronic
Alberto Quintana, Carlos Zarco, Nico Dix, Florencio Sanchez, Ignasi Fina, Josep Fontcuberta
Summary: Flexible FeRh films of high crystalline quality can be synthesized by using mica as a substrate, followed by a mechanical exfoliation of the mica, which display a sharp antiferromagnetic to ferromagnetic phase transition. The films exhibit two distinguishable resistance states that can be written after a field-cooling procedure, and the memory states are robust under magnetic fields of up to 10 kOe.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Physical
Katarzyna Gas, Gerd Kunert, Piotr Dluzewski, Rafal Jakiela, Detlef Hommel, Maciej Sawicki
Summary: Investigation of trilayer structures composed of nominally 45 nm GaN:Mg / 5 nm (Ga,Mn)N / 45 nm GaN:Mg prepared by molecular beam epitaxy on GaN-buffered Al2O3 substrates reveals that the indirect co-doping by holes from the cladding layers may not significantly alter the spin-spin interaction in (Ga,Mn)N, possibly due to the presence of residual Mn in the cladding layers. More technological efforts are suggested to promote the carrier-mediated ferromagnetic coupling in Mn-enriched GaN, particularly at elevated temperatures.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
Anupam Giri, Manish Kumar, Jaeseon Kim, Monalisa Pal, Writam Banerjee, Revannath Dnyandeo Nikam, Junghyeok Kwak, Minsik Kong, Seong Hun Kim, Kaliannan Thiyagarajan, Geonwoo Kim, Hyunsang Hwang, Hyun Hwi Lee, Donghwa Lee, Unyong Jeong
Summary: By utilizing commercial wafers to synthesize wafer-scale single-grain MC thin films and proposing a new mechanism for thin-film formation, it is possible to achieve the fabrication of single-crystal thin films and realize the production of high-performance electronic devices.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Physical
Yujun Zhang, Jiahui Chen, Keisuke Ikeda, Kohei Yamagami, Yue Wang, Yongseong Choi, Akira Yasui, Jing Ma, Yuanhua Lin, Cewen Nan, Hiroki Wadati
Summary: In this study, the magnetism and electronic structure changes across the AFM-FM transition of Ni-doped FeRh epitaxial thin films were investigated using XMCD and HAXPES techniques. The results showed that the remnant FM phase at low temperature possesses a smaller Rh moment than the normal FM phase, while an increase of Rh 4d density of state at the Fermi level and a possible well-screened Ni 2p state were found in the FM phase. In addition, the FM fluctuation of the inter-site Fe-Fe exchange coupling within the AFM phase was observed.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)