Magnetic domain wall dynamics studied by in-situ Lorentz microscopy with aid of custom-made Hall-effect sensor holder

Honkanen, Mari; Lukinmaa, Henri; Kaappa, Sami; Santa-aho, Suvi; Kajan, Jaakko; Savolainen, Samuli; Azzari, Lucio; Laurson, Lasse; Palosaari, Mikko; Vippola, Minnamari

doi:10.1016/j.ultramic.2024.113979

Ultramicroscopy

2024

DOI: 10.1016/j.ultramic.2024.113979

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Magnetic domain wall dynamics studied by in-situ Lorentz microscopy with aid of custom-made Hall-effect sensor holder

Mari Honkanen,

Henri Lukinmaa,

Sami Kaappa

et al.

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Cited by 1 publication

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Magnetic domain walls interacting with dislocations in micromagnetic simulations

Kaappa,

Santa-aho,

Honkanen

et al. 2024

Commun Mater

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Defects, impurities, and embedded particles in ferromagnetic materials are long known to be responsible for the Barkhausen effect due to the jerky field-driven motion of domain walls and have more recently been shown to play a role also in domain wall dynamics in nanoscale ferromagnetic structures used in spintronics devices. Simulating the magnetic domain wall dynamics in the micromagnetic framework offers a straightforward route to study such systems and phenomena. However, the related work in the past suffers from material imperfections being introduced without proper physical foundation. Here, we implement dislocation stress fields in micromagnetic simulations through the induced anisotropy fields by inverse magnetostriction. The effects of individual dislocations on domain wall dynamics in thin films of different Fe surface lattice planes are characterized numerically. As a demonstration of the applicability of the implementation, we consider disorder fields due to randomly positioned dislocations with different densities, and study the avalanche-like transient approach towards the depinning transition of a domain wall driven by a slowly increasing external magnetic field.

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Magnetic domain walls interacting with dislocations in micromagnetic simulations

Kaappa,

Santa-aho,

Honkanen

et al. 2024

Commun Mater

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show abstract

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Magnetic domain wall dynamics studied by in-situ Lorentz microscopy with aid of custom-made Hall-effect sensor holder

Cited by 1 publication

References 14 publications

Magnetic domain walls interacting with dislocations in micromagnetic simulations

Magnetic domain walls interacting with dislocations in micromagnetic simulations

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