Size-dependent spin structures in iron nanoparticles.
Size-dependent spin structures in iron nanoparticles.
复制标题
铁纳米颗粒中尺寸依赖性的自旋结构。
DOI：
10.1103/physrevlett.104.127201
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发表时间：
2010
影响因子：
8.6
通讯作者：
F. Nolting
中科院分区：
文献类型：
--
作者：
A. Fraile Rodríguez;A. Kleibert;J. Bansmann;A. Voitkans;L. Heyderman;F. Nolting
用光电子显微镜研究了铁磁性钴载体上5-25 nm铁单粒子的磁化取向。我们发现，在颗粒尺寸约为6 nm以上，颗粒和衬底磁化强度之间存在非共线排列，而在较小尺寸时，颗粒和衬底磁化强度之间存在平行排列。数值计算表明，随着粒子高度的增加，粒子从交换为主向各向异性为主转变：较小的粒子处于单畴共线状态，而较大的粒子表现出由磁各向异性能量决定的自旋螺旋磁结构。
Using photoemission electron microscopy, we study the magnetization orientation in single 5-25 nm iron particles coupled to a ferromagnetic cobalt support. We find a noncollinear alignment between the particle and substrate magnetization above a particle size of approximately 6 nm and a parallel alignment for smaller sizes. Numerical calculations reveal a transition from an exchange-dominated to an anisotropy-dominated regime on increasing the particle height: the smaller particles are in a single-domain collinear state while larger particles exhibit a spin-spiral magnetic structure determined by the magnetic anisotropy energy.