Particle length and orientation distributions in magnetic recording media

Ishii, Y.; Okamoto, Tetsuhiko; Nishina, H.

doi:10.1016/0304-8853(91)90446-h

Journal of Magnetism and Magnetic Materials

1991

DOI: 10.1016/0304-8853(91)90446-h

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Particle length and orientation distributions in magnetic recording media

Y. Ishii

Tetsuhiko Okamoto

H. Nishina

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Cited by 2 publications

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Magnetic behaviour of a disordered Ising ferrimagnet in a high magnetic field

Ghatak

2012

Philosophical Magazine

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The magnetic behaviour of a disordered ferrimagnetic system ApB1−p where both A and B represent the magnetic atoms with respective spin SA = 1/2 and SB = 1 in presence of high magnetic field is treated theoretically.Assuming the magnetic interaction can be described through Ising Hamiltonian the approximate free energy is obtained using the cluster-variational method.The field dependence of the magnetization is then obtained for different concentration p and exchange parameters (JAA , JBB and JAB ).For p = 0.5,the magnetization M in ferrimagnetic state and in absence of compensation temperature Tcm vanishes at TC.Field induced reversal of M is found at switching temperature TS (< TC ) which is decreasing function of field H.A maximum in M is found above TS and the maximum value of M increases with field.In ferrimagnetic state M increases almost linearly at high H region. For system with large ferromagnetic JAA,the compensation temperature Tcm is increasing function of JBB and JAB.The decrease in compensation temperature is linear at small field and tends to saturate at higher field.The sharpness of the magnetization reversal is increased with H.For fully compensated state of the system with p = 2/3,the magnetization in presence of H also exhibits switching behaviour at TS.For p = 0.2 the field induced reversal of magnetization occurs more sharply.The orientational switching of the sublattice magnetization MA and MB with field increases the Zeeman energy and is the origin of magnetization reversal at TS.

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Magnetic behaviour of a disordered Ising ferrimagnet in a high magnetic field

Ghatak

2012

Philosophical Magazine

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Noise due to particle distributions in metal-particle media

2000

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Particle length and orientation distributions in magnetic recording media

Cited by 2 publications

References 11 publications

Magnetic behaviour of a disordered Ising ferrimagnet in a high magnetic field

Magnetic behaviour of a disordered Ising ferrimagnet in a high magnetic field

Noise due to particle distributions in metal-particle media

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