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安岡 弘志; 元屋 清一郎*; Majumder, M.*; Witt, S.*; Kerllner, C.*; Baenitz, M.*
Journal of the Physical Society of Japan, 85(7), p.073701_1 - 073701_4, 2016/07
被引用回数:3 パーセンタイル:27.44(Physics, Multidisciplinary)The microscopic magnetism in the helical, the conical and the ferromagnetically polarized phases in an itinerant helical magnet, MnSi, has been studied by an ex-tended Si NMR at zero field and under external magnetic fields. The temperature dependence of staggered moment, ), determined by the Si NMR frequency, , and nuclear relaxation rate, 1/ () is in general accord with the SCR theory for weak itinerant ferromagnetic metals and its extension. The external field dependence of resonance frequency, ), follows a vector sum of the contributions from atomic hyperfine and macroscopic fields with a field induced moment characteristic to the itinerant magnets. A discontinuous jump of the resonance frequency at the critical field, , between the conical and the polarized phases has also been found that suggests a first order like change of the electronic states at .
元屋 清一郎*; 日置 敬子*; 鈴木 淳市
Journal of the Physical Society of Japan, 70(Suppl.A), p.139 - 141, 2001/05
濃厚スピングラスFe(NiMn)の長時間緩和現象を時間発展小角散乱法により解析した。20時間に及ぶ緩和過程の解析より、以下の点が明らかとなった。高温強磁性相より低温スピングラス相に試料を急冷すると長距離磁気秩序は消失する。しかし、時間の経過とともに5nm程度の短距離秩序を持つ領域の割合が発達して行く。この結果は、スピングラスの長時間緩和現象は、数nmの磁気クラスターの成長に支配されることを示唆する。