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- W1967543663 abstract "Domain structures of small pseudo‐single domain (PSD) magnetite near the Verwey transition ( T υ ) at ≈120 K were modeled using an unconstrained three‐dimensional micromagnetic algorithm. The single‐domain (SD) threshold ( d 0 ) for the monoclinic phase below T υ was calculated to be ≈0.14 μm at 110 K. However, it is postulated that as a result of the very high energy barriers in the monoclinic phase, grains near d 0 in size and in vortex states are unlikely to denucleate domain walls to become SD. Low‐temperature cycling of saturation isothermal remanence (SIRM), thermoremanence (TRM), and partial TRM (pTRM) through T υ was simulated. Domain structures were found to align along the monoclinic “easy” magnetocrystalline anisotropy axis, i.e., the c axis, on simulated cooling through T υ . This process was found to “destroy” SIRM structures giving rise to demagnetization; however, for TRM and pTRM structures only “closure” domains were removed increasing magnetostatic leakage giving rise to a reversible anomaly in rough agreement with experimental studies. SIRM displayed a smaller anomaly at T υ , in agreement with experimental studies." @default.
- W1967543663 created "2016-06-24" @default.
- W1967543663 creator A5067502295 @default.
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- W1967543663 date "1999-12-10" @default.
- W1967543663 modified "2023-10-13" @default.
- W1967543663 title "Micromagnetic models of pseudo‐single domain grains of magnetite near the Verwey transition" @default.
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- W1967543663 doi "https://doi.org/10.1029/1999jb900294" @default.
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