Monocrystalline high-saturation magnetization ferrites for video recording head application

Stoppels, D.; Boonen, P.G.T.; Enz, U.; Hoof, L.A.H. van

doi:10.1016/0304-8853(83)90331-1

Cited by 11 publications

(2 citation statements)

References 33 publications

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“…According to (16), a figure-of-merit limit for an isotropic specimen can be characterized simply by the value of . The room temperature limit of high-resistivity ferrites appears to be about 5000 G, (although reports of -laden combinations with room-temperature have been reported [8]. One obvious approach would be to lower the operating temperature.…”

Section: High-frequency Transverse Limitsmentioning

confidence: 97%

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Magnetic relaxation and anisotropy effects on high-frequency permeability

Dionne

2003

IEEE Trans. Magn.

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Initial longitudinal permeability and rf signal propagation as a function of angular frequency are examined in terms of spin-lattice interactions that manifest themselves as relaxation time and anisotropy energy density 1 . Domain-wall resonance is analyzed as a classical damped harmonic oscillation forced by longitudinal coupling between magnetization vectors and an alternating magnetic drive field. Gyromagnetic effects from transverse drive fields are reviewed in the context of Snoek's permeability-frequency limits. To explain the observed overlap of longitudinal and transverse regions the physical connection between the longitudinal relaxation frequency and the gyromagnetic resonance frequency is described. Guidelines for extending the permeability and frequency limits of unmagnetized ferrites are: 1) for high , employ large-grain multiple-domain ferrites with low-1 /high-combinations and 2) for high , create small-grain single-domain media with high 1 and low . At microwave frequencies, the lower edge of the gyromagnetic resonance region can overlap the decay of , except in cases where the very high anisotropy of hexagonal ferrites is used for millimeter wavelengths.Index Terms-Domain-wall resonance, high-frequency permeability, magnetic relaxation, Snoek's law.

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Section: High-frequency Transverse Limitsmentioning

confidence: 97%

“…For the value of at , other useful relations can be deduced from (8). Since can also be expressed as from (4), becomes…”

Section: Low-frequency Longitudinal Permeabilitymentioning

confidence: 98%