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Thermal Limits on Field Alignment of Nanoparticle FePt Media

Published

Author(s)

J A. Bain, William F. Egelhoff Jr.

Abstract

We derive a simple expression for the angular distribution of ferromagnetic FePt particles an applied field in thermal equilibrium. This system is closely related to the Langevin expression for paramagnetic susceptibility, which computes the average orientation of particles in this configuration. We note that practical fields are unlikely to be able to provide well-aligned arrays of the smallest thermally stable FePt particles at room temperature and that this has significant consequences for self-organized nanoparticle magnetic media. It suggests that it may be difficult to match the excellent translational order that these arrays can provide with a complementary degree of perfection in orientation for the smallest particles.
Citation
Applied Physics Letters

Keywords

density data, FePt, media, nanoparticles, storage, ultra high

Citation

Bain, J. and Egelhoff Jr., W. (2021), Thermal Limits on Field Alignment of Nanoparticle FePt Media, Applied Physics Letters (Accessed March 2, 2024)
Created October 12, 2021