Journal ArticleDOI
Anisotropic Superexchange Interaction and Weak Ferromagnetism
TLDR
In this paper, the Anderson theory of superexchange was extended to include spin-orbit coupling and the antisymmetric spin coupling suggested by Dzialoshinski from purely symmetry grounds and the symmetric pseudodipolar interaction were derived.Abstract:
A theory of anisotropic superexchange interaction is developed by extending the Anderson theory of superexchange to include spin-orbit coupling. The antisymmetric spin coupling suggested by Dzialoshinski from purely symmetry grounds and the symmetric pseudodipolar interaction are derived. Their orders of magnitudes are estimated to be ($\frac{\ensuremath{\Delta}g}{g}$) and ${(\frac{\ensuremath{\Delta}g}{g})}^{2}$ times the isotropic superexchange energy, respectively. Higher order spin couplings are also discussed. As an example of antisymmetric spin coupling the case of Cu${\mathrm{Cl}}_{2}$\ifmmode\cdot\else\textperiodcentered\fi{}2${\mathrm{H}}_{2}$O is illustrated. In Cu${\mathrm{Cl}}_{2}$\ifmmode\cdot\else\textperiodcentered\fi{}2${\mathrm{H}}_{2}$O, a spin arrangement which is different from one accepted so far is proposed. This antisymmetric interaction is shown to be responsible for weak ferromagnetism in $\ensuremath{\alpha}$-${\mathrm{Fe}}_{2}$${\mathrm{O}}_{3}$, MnC${\mathrm{O}}_{3}$, and Cr${\mathrm{F}}_{3}$. The paramagnetic susceptibility perpendicular to the trigonal axis is expected to increase very sharply near the N\'eel temperature as the temperature is lowered, as was actually observed in Cr${\mathrm{F}}_{3}$.read more
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Journal ArticleDOI
Thickness dependence of the interfacial Dzyaloshinskii–Moriya interaction in inversion symmetry broken systems
Jaehun Cho,Nam-Kook Kim,S Sang Lee,June-Seo Kim,Reinoud Lavrijsen,Amp Aurelie Solignac,Y Yuxiang Yin,Dong-Soo Han,Niels van Hoof,Niels van Hoof,Hjm Henk Swagten,B Bert Koopmans,C-H You +12 more
TL;DR: Here it is demonstrated an experimental technique to straightforwardly observe the IDM interaction, namely Brillouin light scattering, and the non-reciprocal spin wave dispersions allow not only the determination of theIDM energy densities beyond the regime of perpendicular magnetization but also the revelation of the inverse proportionality with the thickness of the magnetic layer.
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Ferroelectrically tunable magnetic skyrmions in ultrathin oxide heterostructures.
Lingfei Wang,Qiyuan Feng,Qiyuan Feng,Yoonkoo Kim,Rokyeon Kim,Ki Hoon Lee,Shawn D. Pollard,Yeong Jae Shin,Haibiao Zhou,Haibiao Zhou,Wei Peng,Daesu Lee,Wenjie Meng,Hyunsoo Yang,Jung Hoon Han,Miyoung Kim,Qingyou Lu,Qingyou Lu,Tae Won Noh +18 more
TL;DR: The discovery of ferroelectrically tunable skyrmions in ultrathin BaTiO3/SrRuO3 bilayer heterostructures is reported and can simultaneously enhance the integratability and addressability ofskyrmion-based functional devices.
Journal ArticleDOI
Skyrmion-based artificial synapses for neuromorphic computing
Kyung Mee Song,Jaeseung Jeong,Biao Pan,Xichao Zhang,Jing Xia,Sun Kyung Cha,Tae Eon Park,Kwangsu Kim,Kwangsu Kim,Simone Finizio,Jörg Raabe,Joonyeon Chang,Joonyeon Chang,Yan Zhou,Weisheng Zhao,Wang Kang,Hyunsu Ju,Seonghoon Woo,Seonghoon Woo +18 more
TL;DR: In this article, the accumulation and dissipation of magnetic skyrmions in ferrimagnetic multilayers can be controlled with electrical pulses to represent the variations in the synaptic weights.
Journal ArticleDOI
Exfoliation of a non-van der Waals material from iron ore hematite
Aravind Puthirath Balan,Aravind Puthirath Balan,Sruthi Radhakrishnan,Cristiano F. Woellner,Shyam Kanta Sinha,Liangzi Deng,Carlos A. de los Reyes,Banki Manmadha Rao,Maggie Paulose,Ram Neupane,Amey Apte,Vidya Kochat,Robert Vajtai,Avetik R. Harutyunyan,Ching-Wu Chu,Ching-Wu Chu,Gelu Costin,Douglas S. Galvao,Angel A. Martí,Peter A. van Aken,Oomman K. Varghese,Chandra Sekhar Tiwary,Anantharaman Malie Madom Ramaswamy Iyer,Anantharaman Malie Madom Ramaswamy Iyer,Pulickel M. Ajayan +24 more
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Journal ArticleDOI
Biskyrmion states and their current-driven motion in a layered manganite
Xiuzhen Yu,Yusuke Tokunaga,Yoshio Kaneko,Weizhu Zhang,Koji Kimoto,Yoshio Matsui,Yasujiro Taguchi,Yoshinori Tokura +7 more
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