Cooperative domain structures in highly anisotropic alloys with twinned microstructure

Vlasova, N.I.; Kandaurova, G. S.; Onoprienko, L.G.; Shchegoleva, N.N.

doi:10.3367/ufnr.0162.199205d.0161

Cited by 1 publication

(1 citation statement)

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“…The evolution of the magnetization is governed by the Landau-Lifshitz-Gilbert equation [15,16]: Extensive investigations have been conducted on FePt polytwin crystals to comprehend the correlation between the microstructures and magnetic properties. Particularly, the {110} twin boundaries and antiphase domains in FePt polytwin crystals have been subjected to experimental and theoretical studies concerning their influence on magnetic domain structures and magnetic properties [5][6][7][8][9][10][11][12][13][14]. However, the effect of polytwin boundaries on magnetic domain structures and properties has rarely been investigated.…”

Section: Phase-field Modelingmentioning

confidence: 99%

Nanostructure Effect on Magnetization Processes in FePt Polytwin Crystals

Yi,

Xu,

Yue

et al. 2023

Materials

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In FePt polytwin crystals with large magnetocrystalline anisotropy, the boundaries may play a crucial role in the magnetization processes occurring under an external magnetic field. In this study, we employed phase-field modeling and computer simulations to systematically investigate the effect of three types of polytwin boundaries—namely, symmetric (Type I), asymmetric (Type II), and mixed (Type III) boundaries—on magnetization processes as well as coercive fields under an external magnetic field along various directions. Because of the large anisotropy of FePt, the domain wall motion mechanism is usually dominant in the domain switching processes, while the magnetization rotation mechanism only becomes important at the late magnetization stage under a high external magnetic field. Among these three types of polytwin boundaries, the low coercivity is mainly due to the domain wall motion process, which starts from the intersection point at the polytwin boundary. The coercive field for the mixed polytwin boundary (Type III) is always in between the values of Type I and II.

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