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今井 正樹; 中堂 博之; 松尾 衛; 前川 禎通; 齊藤 英治
Physical Review B, 102(1), p.014407_1 - 014407_5, 2020/07
被引用回数：0 パーセンタイル：100(Materials Science, Multidisciplinary)The angular momentum compensation temperature 
of ferrimagnets has attracted much attention because of high-speed magnetic dynamics near . We show that NMR can be used to investigate domain wall dynamics near in ferrimagnets. We performed 
Fe-NMR measurements on the ferrimagnet Ho
Fe
O
with = 245 K. In a multi-domain state, the NMR signal is enhanced by domain wall motion. We found that the NMR signal enhancement shows a maximum at in the multi-domain state. The NMR signal enhancement occurs due to increasing domain-wall mobility toward . We develop the NMR signal enhancement model involves domain-wall mobility. Our study shows that NMR in multi-domain state is a powerful tool to determine , even from a powder sample and it expands the possibility of searching for angular momentum-compensated materials.
山ノ内 道彦*; 小山田 達郎*; 佐藤 晃一*; 太田 裕道*; 家田 淳一
IEEE Transactions on Magnetics, 55(7), p.1400604_1 - 1400604_4, 2019/07
被引用回数：0 パーセンタイル：100(Engineering, Electrical & Electronic)We investigated the coercive field 
for Domain Wall (DW) motion as a function of the current 
in the ferromagnetic oxide SrRuO, a model system with narrow DWs for fabricating high-density spintronics devices. The DW is moved by in the direction of the current, and is modulated linearly in . This linear relationship is consistent with an effective magnetic field 
driving the DW. The direction of DW motion and the magnitude of are well described by a model based on the field-like torque arising from the spin relaxation of conduction electrons in the DW.
