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- W2894844440 abstract "We report zero-field low-temperature cycling of saturation remanence (SIRM) produced at 300 or 10 K for crushed natural magnetites in nine size fractions from 0.6 to 135 µm, one set annealed to reduce stress, the other unannealed. Coercivities of isothermal remanence increase tenfold between 300 and 10 K, possibly explaining an apparent transition near 50 K. 300-K SIRM decreases continuously on cooling, losing 60–80% by TV = 120 K (Verwey transition), is constant from 120 to 10 K, then recovers a small memory in warming through TV to 300 K. A dip and recovery of remanence near TV for larger (> 15 µm) annealed grains is probably due to memory of cubic domain structures by monoclinic magnetite below TV, permitting partial recovery of initial remanence. In warming, 10-K SIRM is little affected until lost catastrophically near TV. A small memory is recovered in cooling to 10 K. The contrasting behaviors of 300-K and 10-K SIRMs result from the contrasting anisotropies and domain structures of cubic and monoclinic magnetite. Memories of initial remanences after full temperature cycles are attributed to monoclinic magnetite providing a template for partially regenerating initial cubic domain structures on the second passage through TV. Memory ratios as a function of grain size for our magnetites are too scattered to be granulometrically useful." @default.
- W2894844440 created "2018-10-12" @default.
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- W2894844440 date "2018-10-04" @default.
- W2894844440 modified "2023-09-24" @default.
- W2894844440 title "Remanence cycling of 0.6–135 µm magnetites across the Verwey transition" @default.
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- W2894844440 doi "https://doi.org/10.1186/s40623-018-0928-z" @default.
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