Magnetic hysteresis properties and rotational hysteresis losses of synthetic stress-controlled titanomagnetite (Fe_2.4Ti_0.6O_4) particles-II. Rotational hysteresis losses

Details Magnetic hysteresis properties and rotational hysteresis losses of synthetic stress-controlled titanomagnetite (Fe_2.4Ti_0.6O_4) particles-II. Rotational hysteresis losses Magnetic hysteresis properties and rotational hysteresis losses of synthetic stress-controlled titanomagnetite (Fe_2.4Ti_0.6O_4) particles-II. Rotational hysteresis losses

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999geoji.138..334k&link_type=abstract

Geophysical Journal International, Volume 138, Issue 2, pp. 334-342.

Astronomy and Astrophysics

Astronomy

6

Rock Magnetism, Rotational Hysteresis Losses, Small Particles, Titanomagnetite

Scientific paper

Rotational hysteresis losses W_RH of a ferro- or ferrimagnet (determined by torque measurements) give information on anisotropies related to irreversible magnetization processes. We measured W_RH as a function of magnetic field H for milled and etched synthetic titanomagnetite Fe_2.4Ti_0.6O_4 particles of 2.4, 12.5 and 165 μm grain size, which are assumed to show stress-controlled magnetic properties, between room temperature and the Curie point. For uniaxial single-domain (SD) particles, typical parameters that can be determined are in the low-field range a critical field for the onset of W_RH, a peak W_RH and a further typical field in the high-field region where W_RH tends to zero; all these parameters are associated with the anisotropy constant. For 2.4 μm particles, assumed to be SD, the large experimental W_RH at all fields in the whole temperature range is ascribed predominantly to the action of high internal microstresses arising from a large density of dislocations and other lattice defects introduced by the milling process. The reduced magnitude of W_RH for pseudo-single-domain 12.5 μm particles and the still smaller W_RH for multidomain (MD) 165 μm particles is thought to be in the first place the result of much lower defect densities in conjunction with irreversible domain rotations. For each particle size, a rise of some W_RH parameters is observed for temperatures >120 degC, which coincides for MD 165 μm particles with an increase of magnetic hysteresis parameters. The non-zero W_RH at the maximum applied field of H=1200 kA m^-1~15 kOe for all particles in the whole temperature region analysed is attributed to some kind of exchange anisotropy, caused by centres or areas in a particle related to a very high anisotropy, due probably to Fe^2+ in the neighbourhood of lattice defects.

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