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

Sphere diamter
Exchange length
External magnetic field
Damping parameter
Time is measured in

Here is lattice constant.