Magnetic domain walls in nanostrips of single-crystalline Fe4N thin films with fourfold in-plane magnetic anisotropy

Abstract : We investigated head-to-head domain walls in nanostrips of epitaxial $\mathrm{Fe}_4\mathrm{N}(001)$ 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.
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Contributor : Olivier Fruchart <>
Submitted on : Wednesday, November 25, 2015 - 12:27:44 PM
Last modification on : Thursday, May 16, 2019 - 10:52:42 AM

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Keita Ito, Nicolas Rougemaille, Stefania Pizzini, Syuta Honda, Norio Ota, et al.. Magnetic domain walls in nanostrips of single-crystalline Fe4N thin films with fourfold in-plane magnetic anisotropy. Journal of Applied Physics, American Institute of Physics, 2017, 121 (24), pp.243904. ⟨10.1063/1.4989991⟩. ⟨hal-01233511⟩

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