A study on magnetization model for particulate media

The leakage magnetic field of a single gamma -Fe/sub 2/O/sub 3/ 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 gamma -Fe/sub 2/O/sub 3/ particulate media observed by high-resolution scanning electron microscopy, M-H loops and H/sub c/- Omega 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.<
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