A study on magnetization model for particulate media

Author

Tsutsumi, M. ; Kugiya, F. ; Hasegawa, S. ; Tonomura, A.

Author_Institution

Hitachi Ltd., Odawara, Japan

Volume

25

Issue

5

fYear

1989

fDate

9/1/1989 12:00:00 AM

Firstpage

3665

Lastpage

3667

Abstract

The leakage magnetic field of a single γ-Fe₂O₃ particle is observed by electron holography to be approximately single domain and uniaxial. On the basis of this result, a vector magnetization model is introduced in which curling and rotation in unison modes for a prolate take place. Using this model and the particle size and orientation distributions in γ-Fe₂O₃ particulate media observed by high-resolution scanning electron microscopy, M-H loops and H_c-Ω characteristics of the film are calculated. Moreover, read/write simulations of the isolated pulses are performed using the finite element method. These calculated results agree fairly well with measurements

Keywords

ferrites; iron compounds; magnetic recording; magnetic thin films; magnetisation; particle size; storage media; Fe₂O₃ films; H_c-Ω characteristics; M-H loops; electron holography; ferrite; finite element method; high-resolution scanning electron microscopy; isolated pulses; leakage magnetic field; mode curling; mode rotation; orientation distributions; particle size; particulate media; prolate; read/write simulations; recording media; single γ-Fe₂O₃ particle; unison modes; vector magnetization model; Atmospheric modeling; Electrons; Holography; Magnetic field measurement; Magnetic fields; Magnetic flux; Magnetic heads; Magnetic properties; Magnetic recording; Saturation magnetization;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.42397

Filename

42397