Unveiling the anisotropic fractal magnetic domain structure in bulk crystals of antiskyrmion host (Fe,Ni,Pd)3P by small-angle neutron scattering
Unveiling the anisotropic fractal magnetic domain structure in bulk crystals of antiskyrmion host (Fe,Ni,Pd)3P by small-angle neutron scattering
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通过小角中子散射揭示反斯格明子主体 (Fe,Ni,Pd)3P 块状晶体中的各向异性分形磁畴结构
DOI：
10.1107/s1600576722008561
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发表时间：
2022
影响因子：
6.1
通讯作者：
White Jonathan S.
中科院分区：
文献类型：
--
作者：
Karube Kosuke;Ukleev Victor;Kagawa Fumitaka;Tokura Yoshinori;Taguchi Yasujiro;White Jonathan S.
金属间化合物Pd-doped（Fe，Ni）3 P具有S4对称性的非中心对称四面体结构，最近发现其具有磁性反涡旋结构。在这种材料中，单轴磁各向异性和偶极相互作用起着重要的作用，引起精细分支的磁畴模式附近的散装晶体的表面，如先前的磁力显微镜（MFM）测量所揭示的。然而，小角中子散射（SANS）是一个更合适的方法来表征块体性质和分形结构的介观长度尺度。本文利用SANS和MFM对3 P单晶体的磁畴结构进行了定量研究。Fe0.63Ni0.30Pd0.07 SANS的结果表明，磁畴结构表现出各向异性的分形特征的长度尺度上的磁畴壁的宽度。在磁场中的分形特征逐渐丢失，并观察到不同的字段依赖性在300和2 K由于温度依赖性的各向异性。 这项研究量化了反螺旋材料中高度各向异性磁畴结构的分形，并强调了SANS在磁性系统分形结构研究中的多功能性。
Intermetallic Pd-doped (Fe,Ni)3P, which crystallizes in a non-centrosymmetric tetragonal structure with S4 symmetry, has recently been discovered to host magnetic antiskyrmions, antivortex-like topological spin textures. In this material, uniaxial magnetic anisotropy and dipolar interactions play a significant role, giving rise to finely branched magnetic domain patterns near the surface of bulk crystals, as revealed by a previous magnetic force microscopy (MFM) measurement. However, small-angle neutron scattering (SANS) is a more suitable method for characterizing bulk properties and fractal structures on the mesoscopic length scale. In this study, using SANS and MFM, the magnetic domain structure in bulk single crystals of (Fe0.63Ni0.30Pd0.07)3P is quantitatively investigated. The SANS results demonstrate that the magnetic domain structure exhibits anisotropic fractal character on length scales down to the width of the magnetic domain walls. The fractal features are gradually lost in magnetic fields, and different field dependencies are observed at 300 and 2 K due to a temperature-dependent anisotropy. This study quantifies the fractality of the highly anisotropic magnetic domain structures in an antiskyrmion material, and highlights the versatility of SANS for the study of fractal structures in magnetic systems.
DOI：
10.2307/2532125
发表时间：
1990-03
期刊：
--
影响因子：
--
作者：
K. Falconer
通讯作者：
K. Falconer