Temperature-induced mixed magnetic states in FeRh@FeO composite nanoparticlesстатья
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Дата последнего поиска статьи во внешних источниках: 15 февраля 2024 г.
Аннотация:We have studied magnetization process of 260 nm sized cubic Fe3O4 particles below and above the Verwey transition temperature 𝑇v ∼ 110 K, by measurements of magnetic first-order reversal curves (FORCs) and high-resolution power neutron diffraction. The FORC diagram exhibits two distinct FORC distribution peaks below 𝑇v, which shift towards the origin, merge into a single peak on heating, whereas only a single FORC peak appears above 𝑇v. Neutron diffraction measurements under magnetic fields revealed a minimum of the magnetic intensity at a magnetic field of ∼−300 Oe, being close to the reversal field where the FORC peak is located. These results were interpreted as due to a reorientation and reversal of a spin vortex core, which accompany a large magnetic irreversibility.