Spin fluctuations in Fe2P above its curie temperature

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Abstract

Magnetic fluctuations in a sample of Fe2P at a range of temperatures above its Curie point have been investigated by polarised neutron scattering. Spin correlations up to a distance of 12 Å are found to persist up to at least 780 K (3.7TC). The mean square paramagnetic moment of the iron atoms decreases slightly with temperature but is similar (1.9μ2B) to that observed in the ferromagnetic phase.

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      2016, Journal of Science: Advanced Materials and Devices
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      However, in the FM state, Fe carries a large magnetic moment instead of forming chemical bonds, due to the redistribution of electron density around Fe atoms. For many itinerant magnets, spin correlations have been experimentally detected above TC, e.g. Fe [51–53], Ni [52,54], Fe–Ni invar alloy [55], ErCo2 [34], and Fe2P [45,49]. Here we report μSR studies on the spin correlations of (Mn,Fe)2(P,Si) system in the PM regime.

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