Brownian and Néel relaxation times in magnetic particle dynamics

Author

Deissler, R.J. ; Martens, M.A. ; Wu, Yaowu ; Brown, Rebecca

Author_Institution

Dept. of Phys., Case Western Reserve Univ., Cleveland, OH, USA

fYear

2013

fDate

23-24 March 2013

Firstpage

1

Lastpage

1

Abstract

The equations for the well-known Brownian and Néel relaxation times T_B and T_N (given in the Introduction) are not sufficient to determine whether or not the Néel relaxation mechanism may be neglected. In fact, for a sufficiently large magnetic field strength, the Néel relaxation time can change by many orders of magnitude, whereas the Brownian relaxation time is comparatively insensitive to the magnetic field strength. Therefore, even if τ_N >> τ_B, the Néel relaxation mechanism can still be important and even dominate.

Keywords

Brownian motion; Neel temperature; biomagnetism; magnetic domains; magnetic particles; nanomagnetics; nanoparticles; Brownian relaxation time; Neel relaxation times; magnetic field strength; magnetic particle dynamics; single domain magnetic nanoparticle; Fluids; Magnetic fields; Magnetic moments; Magnetomechanical effects; Perpendicular magnetic anisotropy; Saturation magnetization;

fLanguage

English

Publisher

ieee

Conference_Titel

Magnetic Particle Imaging (IWMPI), 2013 International Workshop on

Conference_Location

Berkeley, CA

Print_ISBN

978-1-4673-5520-9

Electronic_ISBN

978-1-4673-5521-6

Type

conf

DOI

10.1109/IWMPI.2013.6528375

Filename

6528375