Title :
A study on magnetization model for particulate media
Author :
Tsutsumi, M. ; Kugiya, F. ; Hasegawa, S. ; Tonomura, A.
Author_Institution :
Hitachi Ltd., Odawara, Japan
fDate :
9/1/1989 12:00:00 AM
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 Hc-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; Hc-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;
Journal_Title :
Magnetics, IEEE Transactions on
