Thermal effects in small metallic particles

Author

Veitch, R.J. ; Richter, H.J. ; Poganiuch, P. ; Jakusch, H. ; Schwab, E.

Author_Institution

BASF AG, Ludwigshafen, Germany

Volume

30

Issue

6

fYear

1994

fDate

11/1/1994 12:00:00 AM

Firstpage

4074

Lastpage

4076

Abstract

The process of thermally assisted switching in small metallic particles is studied by measuring the field dependent fluctuation fields. A correlation is found between the size of crystallographic sub-units rather than the total volume of the particles and the fluctuation fields. Therefore, very small particles can be more stable magnetically than large particles, if they contain only few large crystal grains. The grain volumes are determined by X-ray line broadening measurements on random and on oriented samples. The effect of thermal activation on the switching process is confirmed by measuring the recording currents needed to optimize high frequency output in tape samples prepared with the same particles

Keywords

X-ray diffraction; magnetic particles; magnetic switching; magnetocaloric effects; X-ray line broadening; crystal grains; crystallographic sub-unit size; currents; fluctuation fields; grain volumes; high frequency output; magnetic stability; oriented samples; particle volume; random samples; small metallic particles; tape samples; thermal activation; thermal effects; thermally assisted switching; Iron; Magnetic field measurement; Magnetic properties; Magnetic recording; Magnetization; Particle measurements; Size measurement; Switches; Time measurement; Volume measurement;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.333993

Filename

333993