Browsing by Author "Sahu, Sanghamitra"
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Item IRM Quarterly, Volume 02, Number 2 (Summer 1992). Cover article: MOKE Magnifies Magnetic Moments [Magnificently!](University of Minnesota. Institute for Rock Magnetism, 1992) Hunt, Chris; Sahu, SanghamitraItem IRM Quarterly, Volume 03, Number 2 (Summer 1993). Cover article: Performing Tasks at the IRM Takes Time(University of Minnesota. Institute for Rock Magnetism, 1993) Brachfeld, Stefanie; Foss, Sherry; Hunt, Chris; Kletetschka, Gin; Marvin, Jim; Moskowitz, Bruce; Rubin, Scott; Sahu, Sanghamitra; Solheid, PeatItem IRM Quarterly, Volume 03, Number 3 (Fall 1993). Cover article: Tasks at the IRM Still Take Time(University of Minnesota. Institute for Rock Magnetism, 1993) Brachfeld, Stefanie; Foss, Sherry; Hunt, Chris; Kletetschka, Gin; Marvin, Jim; Moskowitz, Bruce; Rubin, Scott; Sahu, Sanghamitra; Solheid, PeatItem IRM Quarterly, Volume 03, Number 4 (Winter 1993-1994). Cover article: Tasks at the IRM Take Time, Part III(University of Minnesota. Institute for Rock Magnetism, 1994) Brachfeld, Stefanie; Foss, Sherry; Hunt, Chris; Kletetschka, Gin; Marvin, Jim; Moskowitz, Bruce; Rubin, Scott; Sahu, Sanghamitra; Solheid, PeatItem Magnetic force microscopy of single crystal magnetite (Fe3O4)(Journal of Applied Physics (American Institute of Physics), 1994) Proksch, Roger; Foss, Sherry; Orme, C.; Sahu, Sanghamitra; Moskowitz, BruceItem Thermal dependence of magnetocrystalline anisotropy and magnetostriction constants of single crystal Fe2.4Ti0.61O4(Geophysical Research Letters (American Geophysical Union), 1995) Sahu, Sanghamitra; Moskowitz, BruceThe 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.