Article
Materials Science, Multidisciplinary
H. C. Lyu, Y. C. Zhao, J. Qi, G. Yang, J. X. Shen, J. Y. Zhang, B. K. Shao, Z. Z. Zhu, Y. Sun, B. G. Shen, W. D. Qin, Y. Q. Guo, S. G. Wang
Summary: Surface reconstruction influences the in-plane magnetic anisotropy of epitaxial Fe/Co bilayers, especially leading to a reconstruction-dependent in-plane spin reorientation transition at a Co layer thickness of 3 nm. This transition is attributed to the significantly enhanced magnetic interface anisotropy of Fe/Co bilayers due to the reconstruction.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Zhibo Zhao, Arun Kumar Jaiswal, Di Wang, Vanessa Wollersen, Zhengyu Xiao, Gajanan Pradhan, Federica Celegato, Paola Tiberto, Maria Szymczak, Juliusz Dabrowa, Moaz Waqar, Dirk Fuchs, Xiaoqing Pan, Horst Hahn, Robert Kruk, Abhishek Sarkar
Summary: High entropy oxides (HEOs) provide the possibility to explore new oxide compositions and properties by incorporating multiple-principal cations. This study demonstrates that epitaxial strain can selectively stabilize certain magneto-electronic states in HEOs. The coexistence of rocksalt and spinel-HEO phases in epitaxial (Co0.2Cr0.2Fe0.2Mn0.2Ni0.2)(3)O-4 thin films is revealed, with changes in magnetic anisotropy and domain structure under different strain states.
Article
Chemistry, Physical
Shekhar Tyagi, V. G. Sathe, Gaurav Sharma, Rajeev Rawat
Summary: In this study, epitaxial thin films of SrRuO3 with large strain disorder were grown using pulsed laser deposition on LSAT and SrTiO3 substrates. Magnetic force microscopy was used to visualize the evolution of magnetic domains across the two transitions in these films. The results showed that the magnetic anisotropy in the films was different for the two transitions, with perpendicular magnetic anisotropy dominating. Raman spectroscopy revealed a strong influence of magnetic order on the lattice, indicating a strong spin-phonon coupling.
APPLIED SURFACE SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Z. Kurant, S. K. Jena, R. Gieniusz, U. Guzowska, M. Kisielewski, P. Mazalski, I Sveklo, A. Pietruczik, A. Lynnyk, A. Wawro, A. Maziewski
Summary: We studied the magnetic properties of epitaxial Pt/W(d(w))/Co(d(Co))/Pt layered films as a function of W(d(w)) and Co(d(Co)) layer thicknesses. The influence of the bottom W layer on magnetic anisotropy, spin reorientation transition, and magnetic polarization of the interface atoms was observed. Different magnetic states were observed with decreasing Co layer thickness. The transition from hard to soft magnetic material with out-of-plane magnetization was found with changing W layer thickness. The domain structures at the out-of-plane state were sensitive to both Co and W layer thicknesses as well as the external magnetic field. Dzyaloshinskii-Moriya interaction was inferred from the Brillouin light scattering measurements.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Maria Blanco-Rey, Paolo Perna, Adrian Gudin, Jose Manuel Diez, Alberto Anadon, Pablo Olleros-Rodriguez, Leticia de Melo Costa, Manuel Valvidares, Pierluigi Gargiani, Alejandra Guedeja-Marron, Mariona Cabero, Maria Varela, Carlos Garcia-Fernandez, Mikhail M. Otrokov, Julio Camarero, Rodolfo Miranda, Andres Arnau, Jorge Cerda
Summary: The research indicates that nanometer-thick epitaxial Co films intercalated between graphene and a heavy metal substrate exhibit large perpendicular magnetic anisotropy, with stable magnetic behavior achieved through the optimization of structural defects.
ACS APPLIED NANO MATERIALS
(2021)
Article
Physics, Applied
Daisuke Kan, Takahiro Moriyama, Ryotaro Aso, Shinji Horai, Yuichi Shimakawa
Summary: We grew epitaxial thin films of hematite on Al2O3 substrates and investigated their magnetic properties. The films undergo Morin transition at higher temperatures when grown at lower temperatures. The magnetic properties were characterized by spin Hall magnetoresistance, revealing tri-axial magnetic anisotropy and large changes in SMR ratio associated with Neel vector re-orientation due to Morin transition.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Applied
Daisy O'Mahoney, Sanyum Channa, Xin Yu Zheng, Arturas Vailionis, Padraic Shafer, Alpha T. N'Diaye, Christoph Klewe, Yuri Suzuki
Summary: Developed epitaxial spinel structure ferrite thin films of Li-0.5(AlxFe2.5-x)O-4 with ultra-low magnetic damping. Al substitution tunes saturation magnetization and in-plane magnetic anisotropy while maintaining excellent epitaxy and low damping. Element-specific x-ray magnetic circular dichroism measurements confirm magnetism originates from Fe3+ cations occupying octahedral sites.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Alison Cowan, Kevin McNeill, Muhammad Bilal Janjua, Stephen McVitie
Summary: The study investigated the impact of ultra-thin Ni79Fe21 seed layers on the physical and magnetic behavior of Ni45Fe55 films. The addition of seed layers reduced grain size, improved film texture, and enhanced magnetic properties. The use of magnetic microscopy allowed for precise characterization of the material's magnetic structure.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Evgeny O. O. Anokhin, Danila A. A. Deyankov, Zitian Xia, Ekaterina S. S. Kozlyakova, Vasily A. A. Lebedev, Anatolii V. V. Morozov, Daniil A. A. Kozlov, Roy R. R. Nygaard, Dmitry I. I. Petukhov, Lev A. A. Trusov
Summary: In this study, sandwiched composite nanomagnets consisting of hexaferrite cores and magnetite outer layers were synthesized. Hexaferrite plate-like nanoparticles were prepared via a glass crystallization method and covered with spinel-type iron oxide. The hexaferrite nanoplates acted as seeds for the epitaxial growth of magnetite, resulting in uniform continuous outer layers. The thickness of the layers could be adjusted by controlling the concentration of metal ions. The developed approach can be applied to other spinel-type materials, expanding the performance of hexaferrite nanomagnets.
Article
Physics, Applied
T. Strusch, K. Lenz, R. Meckenstock, R. Bali, J. Ehrler, J. Lindner, J. Fassbender, M. Farle, K. Potzger, A. Semisalova
Summary: In this study, we investigate the spin pumping efficiency and determine the spin mixing conductance and spin diffusion length in thin bilayer films based on 3d transition metal alloy Fe60Al40. We demonstrate that the Fe60Al40 alloy exhibits dual functionality in spin pumping structures, which may have potential value in spintronic applications.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Multidisciplinary Sciences
Xiaoqian Zhang, Qiangsheng Lu, Wenqing Liu, Wei Niu, Jiabao Sun, Jacob Cook, Mitchel Vaninger, Paul F. Miceli, David J. Singh, Shang-Wei Lian, Tay-Rong Chang, Xiaoqing He, Jun Du, Liang He, Rong Zhang, Guang Bian, Yongbing Xu
Summary: Growth and properties of single- and few-layer CrTe2 on bilayer graphene by molecular beam epitaxy (MBE) have shown intrinsic ferromagnetism with a Curie temperature up to 300 K and perpendicular magnetic anisotropy, providing a new avenue for developing large-scale 2D magnet-based spintronics devices.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Tatsuya Yamamoto, Takayuki Nozaki, Kay Yakushiji, Shingo Tamaru, Hitoshi Kubota, Akio Fukushima, Shinji Yuasa
Summary: The study shows that Ta layer in MgO/Ta/CoFeB/MgO junctions can enhance the PMA of magnetic films and eliminate the diffusion of Ta, leading to superior thermal stability and the release of VCMA effect. In addition, the Co-Fe compositional variation in CoFeB layer associated with Ta insertion is related to the changes in PMA and VCMA.
Article
Materials Science, Multidisciplinary
Hyeon-Kyu Park, Sang-Koog Kim
Summary: The study theoretically explored the ultrafast propagations of spin waves in antiferromagnetic Bloch-type domain walls and found that the dispersive relation of these spin waves shows extremely high group velocity without any forbidden gap. The results offer guidance for the development of ultrafast information signal processing in nanoscale magnonic circuits composed of antiferromagnetic domain walls.
Article
Materials Science, Multidisciplinary
Jie Qi, Yunchi Zhao, Haochang Lyu, Guang Yang, He Huang, Jingyan Zhang, Jianxin Shen, Weidu Qin, Chaoqun Hu, Yang Gao, Yaqin Guo, Bokai Shao, Yi Zhang, Zhaozhao Zhu, Hongxiang Wei, Baogen Shen, Shouguo Wang
Summary: By introducing a 2-monolayer Cr insertion between layers, a twinning structure of the 7-ML ferromagnetic Co layer can be achieved, leading to a significant enhancement of Hall resistivity. Analysis of the crystalline structures suggests that the dominant contribution to Hall resistivity comes from skew scattering, with the remarkable enhancement of p(xy) attributed to the specific twinning structure.
Article
Physics, Applied
Masaaki Tanaka, Motoharu Furuta, Tomoyuki Ichikawa, Masaya Morishita, Yu-Min Hung, Syuta Honda, Teruo Ono, Ko Mibu
Summary: This study demonstrated the generation of perpendicularly spin-polarized electronic currents using a tunnel spin-filtering effect through insulative Fe-rich cobalt ferrite CoxFe3-xO4+delta (I-CFO) barriers with perpendicular magnetic anisotropy (PMA). The combination of well-controlled compositions and lattice strains in spinel-type C-CFO and I-CFO films is applicable as a spin-injection source for spintronics devices when perpendicularly spin-polarized electronic currents are required.
APPLIED PHYSICS LETTERS
(2023)
