Thermal dependence of magnetocrystalline anisotropy and magnetostriction constants of single crystal Fe2.4Ti0.61O4
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Thermal dependence of magnetocrystalline anisotropy and magnetostriction constants of single crystal Fe2.4Ti0.61O4
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1995
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Geophysical Research Letters (American Geophysical Union)
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Article
Abstract
The temperature dependence of the magnetocrystalline anisotropy (K′) and magnetostriction (λ) constants of single crystal Fe2.4Ti0.61O4 (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 <100> instead of <111> crystal directions the easy axes of magnetization in TM61. The thermal dependence of K′(T) varies as (1-T/Tc)2.2. In terms of the saturation magnetization, K′(T)∝Ms(T)n where n≈6, a much weaker dependence than that found for magnetite (n=8–10). We also observed that K′∝λ1–2, consistent with K′∝Ms6. 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.
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This research was supported by NSF Grant EAR-9017389 and is contribution 9413 of the Institute for Rock Magnetism. The IRM is funded by grants from the Keck and National Science Foundations and the University of Minnesota.
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10.1029/94GL03296
Previously Published Citation
Sahu, S. and B. M. Moskowitz (1995). "Thermal dependence of magnetocrystalline anisotropy and magnetostriction constants of single crystal Fe2.4Ti0.61O4." Geophysical Research Letters 22: 449–452
Suggested citation
Sahu, Sanghamitra; Moskowitz, Bruce. (1995). Thermal dependence of magnetocrystalline anisotropy and magnetostriction constants of single crystal Fe2.4Ti0.61O4. Retrieved from the University Digital Conservancy, 10.1029/94GL03296.
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