Magnetic domain walls in nanostrips of single-crystalline $mathrm{Fe}_4mathrm{N}(001)$ thin films with fourfold in-plane magnetic anisotropy
Magnetic domain walls in nanostrips of single-crystalline $mathrm{Fe}_4mathrm{N}(001)$ thin films with fourfold in-plane magnetic anisotropy
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具有四重面内磁各向异性的单晶 $mathrm{Fe}_4mathrm{N}(001)$ 薄膜纳米带中的磁畴壁
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
O. Fruchart
中科院分区：
文献类型：
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作者：
K. Ito;N. Rougemaille;S. Pizzini;S. Honda;N. Ota;T. Suemasu;O. Fruchart
研究了外延生长的$mathrm{Fe}_4mathrm{N}（001）$薄膜纳米带中的头对头畴壁，显示出四重磁各向异性。磁力显微镜和微磁模拟表明，畴壁具有特定的属性，相比软磁材料。特别地，沿磁化的难磁化轴沿着对准的条带被低于临界宽度的部分磁通闭合手风琴状畴包裹，同时逐渐地转变为用于较宽条带的锯齿形壁。横向壁是有利的，在初始应用的磁场横向的带，而转变为涡流壁是有利的，在纵向磁场下的运动。在所有情况下，这种四重各向异性畴壁的磁化织构表现出狭窄的微畴壁，这可能会引起特殊的自旋转移功能。
We investigated head-to-head domain walls in nanostrips of epitaxial $mathrm{Fe}_4mathrm{N}(001)$ thin films, displaying a fourfold magnetic anisotropy. Magnetic force microscopy and micromagnetic simulations show that the domain walls have specific properties, compared to soft magnetic materials. In particular, strips aligned along a hard axis of magnetization are wrapped by partial flux-closure concertina domains below a critical width, while progressively transforming to zigzag walls for wider strips. Transverse walls are favored upon initial application of a magnetic field transverse to the strip, while transformation to a vortex walls is favored upon motion under a longitudinal magnetic field. In all cases the magnetization texture of such fourfold anisotropy domain walls exhibits narrow micro-domain walls, which may give rise to peculiar spin-transfer features.