Article
Materials Science, Multidisciplinary
Bo-Yao Wang, Tzu-Hsin Li, Bo -Xiang Liao, Chung-Hsuan Hsiao, Li-Han Chang, Ming-Shian Tsai, Tzu-Hung Chuang, Der-Hsin Wei
Summary: This study explores the use of antiferromagnetic (AFM) thin films to manipulate perpendicular magnetic anisotropy (PMA) in ferromagnetic (FM) thin films. By adjusting the AFM layer in a composite material, long-range AFM ordering in adjacent AFM materials can be enhanced, and control over their spin structure can be exerted, resulting in the induction of PMA in neighboring FM films.
Article
Engineering, Electrical & Electronic
Lucia Fecova, Kornel Richter, Rastislav Varga
Summary: This study investigates amorphous glass-coated Fe-Si-B-P microwires with an induced gradient of perpendicular magnetic anisotropy. It is found that thermal annealing results in the relaxation of internal mechanical stresses, which suppresses the effect of the perpendicular magnetic field, decreases domain wall mobility, and increases the critical field. Additionally, the slow cooling rate after thermal annealing induces a new mechanical stress distribution and directional growth of crystals.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Article
Chemistry, Multidisciplinary
Trevor P. Almeida, Steven Lequeux, Alvaro Palomino, Ricardo C. Sousa, Olivier Fruchart, Ioan-Lucian Prejbeanu, Bernard Dieny, Aurelien Masseboeuf, David Cooper
Summary: This study investigates the magnetism of a NiFe PSA-STT-MRAM nanopillar using off-axis electron holography. The results show that the PSA of the nanopillar is maintained up to at least 250 degrees Celsius, with a moderate decrease in magnetic induction. Therefore, PSA provides significant stability in STT-MRAM applications.
Article
Crystallography
Zhenxian Zhao, Xiaocha Wang, Wenbo Mi
Summary: The discovery of ferromagnetic two-dimensional (2D) materials provides reference value for the exploration of low-dimensional magnetism and new spintronic devices. The VSi2N4 monolayer is a new 2D material in the field of spintronics, which is ferromagnetic with half-metallic characteristics. The electronic structure and magnetic anisotropy of two-dimensional VSi2X2N2 (X = P, As, Sb, Bi) Janus monolayers are systematically studied via first-principles calculations. The results show that VSi2P2N2, VSi2As2N2, and VSi2Bi2N2 are magnetic, while VSi2Sb2N2 is nonmagnetic. These data provide basic theoretical guidance for the development of low-dimensional spintronic devices.
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
Physics, Applied
J. D. Miller, H. J. Trodahl, M. Al Khalfioui, S. Vezian, B. J. Ruck
Summary: A unique bulk-origin perpendicular magnetic anisotropy (PMA) was found in thin films of the cubic ferromagnetic semiconductor GdxSm1-xN. The films exhibited out-of-plane remanence reaching 80% of the saturation magnetization in films with up to 30% Gd, as indicated by in-vs-out-of-plane magnetic hysteresis. Anomalous Hall effect data showed that the conduction-band spin imbalance retained 100% remanence, maintaining half-metallic conduction even when the out-of-plane applied field was reduced to zero, in contrast to the 80% magnetization remanence. The occurrence of PMA in this cubic material was discussed as stabilized by a mixture of two in-plane crystal orientations in the epitaxial (111)-oriented films.
APPLIED PHYSICS LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Qi Liu, Pengfei Liu, Xiaowen Li, Sixia Hu, Yuanmin Zhu, Cai Jin, Wenqiao Han, Yanjiang Ji, Zedong Xu, Songbai Hu, Mao Ye, Lang Chen
Summary: By designing and fabricating manganite-based magnetic tunnel junctions, we achieved perpendicular tunneling and observed spin-dependent tunneling behavior. The dominant role of direct tunneling was observed in the low bias region, while it was associated with thermionic emission in the high bias region.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Review
Mathematics, Applied
Gabriel D. Chaves-O'Flynn, D. L. Stein
Summary: In this paper, the authors review the challenges associated with thermal activation in nanoscopic magnetic systems and discuss transitions between different magnetic structures. The findings have important implications for understanding the behavior of thermal activation in nanoscale magnetic systems.
PHYSICA D-NONLINEAR PHENOMENA
(2023)
Article
Chemistry, Physical
Young Chan Won, Jae-Pyoung Ahn, Sang Ho Lim
Summary: This study investigated the perpendicular magnetic anisotropy (PMA) and microstructure of Pt/Co/AlN stacks. It was found that the magnetic moment significantly increased after annealing, leading to strong PMA. The effective PMA energy densities were 2.28 and 1.96 x 10(7) erg/cm(3) after annealing at 300 and 400 degrees C, respectively. High-resolution cross-sectional transmission electron microscopy confirmed the presence of strong PMA.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Physics, Applied
A. Roman, A. Lopez Pedroso, K. Bouzehouane, J. E. Gomez, A. Butera, M. H. Aguirre, M. Medeiros Soares, C. Garcia, L. B. Steren
Summary: The competition between shape and perpendicular magnetic anisotropies in magnetic thin films leads to unconventional magnetic behaviors. In ferromagnetic thin films, the out-of-plane component of magnetic anisotropy can induce a transition from planar to stripe-like magnetic domains above a critical thickness, tc. This article presents a detailed study of the magnetization switching mechanism in FePt thin films where this phenomenon is observed. Micromagnetic simulations and experiments show that below tc, the reversal mechanism is well described by the two-phase model, while above this thickness, the magnetization within each stripe reverses through coherent rotation. The out-of-plane component and its temperature dependence of the magnetic anisotropy were also analyzed, indicating that substrate-induced strains are responsible for the abnormal coercive field behavior observed for FePt films with t > tc.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
A. Sakoguchi, D. Oshima, S. Iwata, T. Kato
Summary: The electric field modulation of PMA and magnetization dynamics in MgO/Co/Pt trilayers was investigated using TRMOKE. The results showed that the PMA and α were both influenced by the electric field. Similar effects were observed in trilayers with MgO(111)/fcc-Co interface.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Article
Materials Science, Multidisciplinary
Penghua Kang, Guowei Zhou, Huihui Ji, Zhiqin Li, Zhilan Li, Xiaohong Xu
Summary: In this work, high-quality NiCo2O4 films were successfully developed by precise control over the growth parameters in the pulsed laser deposition process. The films demonstrated strong out-of-plane magnetic easy axis, robust anomalous Hall effect, and smaller angle dependence of magnetoresistance in perpendicular direction. The cation concentration ratio was found to have a significant influence on the magnetism and electric transport.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Maria Ameziane, Rhodri Mansell, Ville Havu, Patrick Rinke, Sebastiaan van Dijken
Summary: This study demonstrates the reversible voltage-controlled switching between perpendicular and in-plane magnetization states in a Co-Pt bilayer using solid-state lithium-ion battery technology. Due to the small size and high mobility of lithium ions, small voltages produce an exceptionally high magnetoelectric coupling efficiency. The magnetic switching effect is attributed to the modulation of spin-orbit coupling at the Co-Pt interface when lithium ions migrate between a lithium storage layer and the magnetic interface across a solid-state electrolyte.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Mengchao Li, Huali Yang, Yali Xie, Kai Huang, Lili Pan, Wei Tang, Xilai Bao, Yumeng Yang, Jie Sun, Xinming Wang, Shenglei Che, Run-Wei Li
Summary: The magnetic properties of flexible magnetic films are sensitive to mechanical stress due to magnetoelastic coupling, which affects the performance of flexible magnetoelectronic devices. We demonstrate that stacking different materials in multilayers can enhance the stress stability of the magnetic properties. The strength of magnetoelastic anisotropy and the initial effective magnetic anisotropy play significant roles in determining the stress stability of the film.
Article
Chemistry, Physical
Qingwang Bai, Jie Jiang, Bin Guo, Wentian Cao, Xianwu Xiu, Shuyun Wang
Summary: Increasing the interfaces of heavy metal ferromagnetic (HM/FM) can enhance the perpendicular magnetic anisotropy (PMA) of multilayers. The addition of more Pd/CMS interfaces can improve PMA and magnetic saturation (M-s), leading to reduced energy consumption in magnetic recording writing.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Multidisciplinary Sciences
Y. Dovzhenko, F. Casola, S. Schlotter, T. X. Zhou, F. Buttner, R. L. Walsworth, G. S. D. Beach, A. Yacoby
NATURE COMMUNICATIONS
(2018)
Article
Nanoscience & Nanotechnology
Lucas Caretta, Maxwell Mann, Felix Buettner, Kohei Ueda, Bastian Pfau, Christian M. Guenther, Piet Hessing, Alexandra Churikoval, Christopher Klose, Michael Schneider, Dieter Engel, Colin Marcus, David Bono, Kai Bagschik, Stefan Eisebitt, Geoffrey S. D. Beach
NATURE NANOTECHNOLOGY
(2018)
Article
Physics, Multidisciplinary
Can Onur Avci, Johannes Mendil, Geoffrey S. D. Beach, Pietro Gambardella
PHYSICAL REVIEW LETTERS
(2018)
Article
Chemistry, Physical
Aik Jun Tan, Mantao Huang, Can Onur Avci, Felix Buttner, Maxwell Mann, Wen Hu, Claudio Mazzoli, Stuart Wilkins, Harry L. Tuller, Geoffrey S. D. Beach
Article
Nanoscience & Nanotechnology
Can Onur Avci, Ethan Rosenberg, Lucas Caretta, Felix Buttner, Maxwell Mann, Colin Marcus, David Bono, Caroline A. Ross, Geoffrey S. D. Beach
NATURE NANOTECHNOLOGY
(2019)
Article
Engineering, Electrical & Electronic
Minae Ouk, Geoffrey S. D. Beach
IEEE TRANSACTIONS ON MAGNETICS
(2019)
Article
Physics, Applied
A. Churikova, D. Bono, B. Neltner, A. Wittmann, L. Scipioni, A. Shepard, T. Newhouse-Illige, J. Greer, G. S. D. Beach
APPLIED PHYSICS LETTERS
(2020)
Review
Chemistry, Physical
Se Kwon Kim, Geoffrey S. D. Beach, Kyung-Jin Lee, Teruo Ono, Theo Rasing, Hyunsoo Yang
Summary: Ferrimagnets, composed of multiple antiferromagnetically coupled magnetic elements, offer advantages of both ferromagnets and antiferromagnets, including easy control of magnetization by external field, faster dynamics than ferromagnets, and potential for high-density devices. This Review provides a summary of recent progress in ferrimagnetic spintronics, focusing on functionalities such as spin transport, spin texture dynamics, and all-optical switching.
Article
Physics, Applied
Alexander E. Kossak, Daniel Wolf, Geoffrey S. D. Beach
Summary: The magneto-ionic control of magnetic anisotropy is an emerging voltage-controlled approach with potential for low power consumption and various applications. By systematically studying Co/Pd multilayer heterostructures, higher efficiency in magnetic anisotropy control can be achieved.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Applied
S. Sheffels, P. P. Balakrishnan, M. Huang, S. Muramoto, J. A. Borchers, J. A. Dura, A. J. Grutter, G. S. D. Beach
Summary: Ionic and redox control of magnetism using a small voltage can significantly change magnetic properties. In this study, the effects of hydration and electrical gating on the Pt/Co/GdOxHy/Au structure were observed using polarized neutron reflectometry (PNR). The transformation from oxide to hydroxide was confirmed, and complex chemistry at the Co/GdOxHy interface was found. Proton dynamics in the system were analyzed using PNR and secondary ion mass spectrometry.
APPLIED PHYSICS LETTERS
(2023)
Article
Multidisciplinary Sciences
Alexander E. Kossak, Mantao Huang, Pooja Reddy, Daniel Wolf, Geoffrey S. D. Beach
Summary: In the field of antiferromagnetic (AFM) spintronics, efforts are being made to use AFMs as active components for efficient and fast devices by manipulating the AFM Neel vector. This study presents a method of enabling AFM active components by directly controlling the magnetic order. By utilizing magneto-ionic gating of hydrogen, the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction in solid-state synthetic AFM multilayer devices can be dynamically controlled, allowing for continuous transitions from AFM to FM and vice versa with submillisecond switching at room temperature.
Article
Physics, Applied
Daniel H. Suzuki, Byung Hun Lee, Geoffrey S. D. Beach
Summary: In this study, the compositional dependence of key spintronic properties in Pt/GdCo alloy series was investigated. The results showed that increasing Gd concentration led to an increase in effective spin Hall angle and improved spin transfer efficiency, while the strength of DMI decreased with increasing Gd content.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Christopher Klose, Felix Buettner, Wen Hu, Claudio Mazzoli, Geoffrey S. D. Beach, Stefan Eisebitt, Bastian Pfau
Summary: This paper proposes a method to reconstruct magnetic scattering signal using heterodyne scattering, which directly represents the magnetization texture. It solves some problems in traditional methods and eliminates the issue of artificial decay of correlation functions through the implementation method.
Article
Multidisciplinary Sciences
Lucas Caretta, Se-Hyeok Oh, Takian Fakhrul, Dong-Kyu Lee, Byung Hun Lee, Se Kwon Kim, Caroline A. Ross, Kyung-Jin Lee, Geoffrey S. D. Beach
Article
Materials Science, Multidisciplinary
Ivan Lemesh, Geoffrey S. D. Beach
