Bloch Point Structure in a Magnetic Nanosphere

Authors:

Oleksandr V. Pylypovskyi, Denis D. Sheka, Yuri Gaididei

Publication:

Phys. Rev. B 85, 224401 (2012), 10.1103/PhysRevB.85.224401

Comments:

8 pages, 7 figures

arXiv:

http://arxiv.org/abs/1112.2413

The micromagnetic singularity, the so–called Bloch point, can form a metastable state in the nanosphere. We classify possible types of Bloch points and derive analytically the shape of magnetization distribution inside different Bloch point. We show that external gradient field can stabilize the Bloch point: the shape of the Bloch point becomes radial–dependent one and compute the magnetization structure of the nanosphere, which is in a good agrement with performed spin–lattice simulations.

Supplementary materials

Bloch point relaxation in a nanosphere

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Sphere diamter 2R_\text{out} = 35a_0
Exchange length \ell=3.95a_0
External magnetic field \textbf H = 4\pi M_\text{sat} \textbf {R}/R_\text{out}
Damping parameter \eta = 0.5
Time is measured in \hbar/JS^2

Here a_0 is lattice constant.

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