Physics
Scientific paper
Feb 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22..449s&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 4, p. 449-452
Physics
11
Anisotropy, Crystal Lattices, Crystal Structure, High Temperature, Iron Oxides, Magnetostriction, Single Crystals, Temperature Dependence, Titanium Oxides, Basalt, Magnetite, Magnetization, Mineralogy, Mixed Oxides, Remanence, Temperature Effects
Scientific paper
The temperature dependence of the magnetocrystalline anisotropy (K') and magentostriction (lambda) constants of single crystal Fe(2,4) Ti(0.61) O4 (TM61) is measured using torque magnetometry and strain gage techniques in the temperature range between 300 K and Tc. At all temperatures, K' is positive making the group of zone axes (100) instead of group of zone axes (111) crystal directions the easy axes of magnetization in TM61. The thermal dependence of K'(T) varies as (1-T/Tc) 102.2. In terms of the saturation magnetization, K'(T) proportional to Ms(T) 10n where n approximately 6, a much weaker dependence than that found for magnetite (n = 8-10). We also observed that K' proportional to lambda1-2, consistent with K' proportional to Ms 106. These results show that the magnetoelastic contribution to the magnetocrystalline anisotropy dominates the anisotropy constant of TM61 at elevated temperature and that the effects of stress cannot be neglected in theories of thermoremanence and micromagnetic models for intermediate titanomagnetites commonly found in oceanic basalts.
Moskowitz Bruce M.
Sahu Sanghamitra
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