Micromagnetism and magnetotransport properties of micron-sized epitaxial CrO2(100) wires
Micromagnetism and magnetotransport properties of micron-sized epitaxial CrO2(100) wires
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DOI：
10.1103/physrevb.75.144428
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发表时间：
2007-04
影响因子：
3.7
通讯作者：
C. König;M. Fonin;M. Laufenberg;A. Biehler;W. Bührer;M. Kläui;U. Rüdiger;G. Güntherodt
中科院分区：
文献类型：
--
作者：
C. König;M. Fonin;M. Laufenberg;A. Biehler;W. Bührer;M. Kläui;U. Rüdiger;G. Güntherodt
我们详细研究了沿不同晶体方向排列的0.5 - 5 m宽的外延CrO2100线的磁畴结构和磁化反转。零场磁力显微镜成像显示沿磁易轴制备的导线呈现单畴态，而垂直于磁易轴制备的导线呈现条形畴态。在外加磁场中的行为和磁化强度的切换是通过磁电阻MR测量来探测的。根据导线相对于易磁晶各向异性轴和硬磁晶各向异性轴和磁场方向的不同，可以观察到明显不同的反转模式，包括不均匀的磁化结构。考虑到不同各向异性项之间的相互作用，可以解释这些模式和构型。在变温度下的磁流变测量表明，低温磁流变响应主要由晶间隧穿磁电阻主导，而在高温下则被各向异性磁流变所取代。
We report a detailed study of the magnetic domain configurations and the magnetization reversal in epitaxial CrO2100 wires 0.5– 5 m widths patterned along different crystallographic directions. Magnetic force microscopy imaging in zero field reveals single domain states for wires fabricated along the magnetic easy axis, while wires perpendicular to the magnetic easy axis exhibit a stripe domain configuration. The behavior in an applied field and the switching of the magnetization is probed by magnetoresistance MR measurements. Depending on the orientation of the wire with respect to the easy and hard magnetocrystalline anisotropy axes and the field direction, distinctly different reversal modes are observed including inhomogeneous magnetization configurations. These modes and configurations can be explained taking into account the interplay between the different anisotropy terms. MR measurements at variable temperatures demonstrate that the low temperature MR response is dominated by intergrain-tunneling magnetoresistance, while at elevated temperatures it is superseded by the anisotropic MR.