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Kim, Kab-Jin,Kim, Se Kwon,Hirata, Yuushou,Oh, Se-Hyeok,Tono, Takayuki,Kim, Duck-Ho,Okuno, Takaya,Ham, Woo Seung,Kim, Sanghoon,Go, Gyoungchoon,Tserkovnyak, Yaroslav,Tsukamoto, Arata,Moriyama, Takahiro Nature Publishing Group 2017 NATURE MATERIALS Vol.16 No.12
Antiferromagnetic spintronics is an emerging research field which aims to utilize antiferromagnets as core elements in spintronic devices. A central motivation towards this direction is that antiferromagnetic spin dynamics is expected to be much faster than its ferromagnetic counterpart. Recent theories indeed predicted faster dynamics of antiferromagnetic domain walls (DWs) than ferromagnetic DWs. However, experimental investigations of antiferromagnetic spin dynamics have remained unexplored, mainly because of the magnetic field immunity of antiferromagnets. Here we show that fast field-driven antiferromagnetic spin dynamics is realized in ferrimagnets at the angular momentum compensation point T<SUB>A</SUB>. Using rare earth–3d-transition metal ferrimagnetic compounds where net magnetic moment is nonzero at T<SUB>A</SUB>, the field-driven DW mobility is remarkably enhanced up to 20 km s<SUP>−1</SUP> T<SUP>−1</SUP>. The collective coordinate approach generalized for ferrimagnets and atomistic spin model simulations show that this remarkable enhancement is a consequence of antiferromagnetic spin dynamics at T<SUB>A</SUB>. Our finding allows us to investigate the physics of antiferromagnetic spin dynamics and highlights the importance of tuning of the angular momentum compensation point of ferrimagnets, which could be a key towards ferrimagnetic spintronics.
Suzuki, Motohiro,Kim, Kab-Jin,Kim, Sanghoon,Yoshikawa, Hiroki,Tono, Takayuki,Yamada, Kihiro T.,Taniguchi, Takuya,Mizuno, Hayato,Oda, Kent,Ishibashi, Mio JAPAN SOCIETY OF APPLIED PHYSICS 2018 Applied physics express Vol.11 No.3
<P>An X-ray tomographic technique was developed to investigate the internal magnetic domain structure in a micrometer-sized ferromagnetic sample. The technique is based on a scanning hard X-ray nanoprobe using X-ray magnetic circular dichroism (XMCD). From transmission XMCD images at the Gd L-3 edge as a function of the sample rotation angle, the three-dimensional (3D) distribution of a single component of the magnetic vector in a GdFeCo microdisc was reconstructed with a spatial resolution of 360 nm, using a modified algebraic reconstruction algorithm. The method is applicable to practical magnetic materials and can be extended to 3D visualization of the magnetic domain formation process under external magnetic fields. (C) 2018 The Japan Society of Applied Physics</P>