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Journal Articles Physical Review B Year : 2022

Comparison of magnetic anisotropy and structural properties in chemically ordered CoPt and FePt nanoparticles

Abstract

The intrinsic magnetic properties of nanoparticles can be accurately determined using highly dispersed nanoparticles in a matrix. In this paper, we study chemically ordered CoPt and FePt nanoparticles with a diameter of 3 nm embedded in an amorphous carbon matrix. Although both alloys exhibit almost the same magnetic and crystallographic properties in the bulk materials, they are completely different as nanoparticles. We show that their magnetic anisotropy differs greatly. In order to understand the origin of such a difference a fine crystallographic structure study has been performed using EXAFS. In that respect, the atomic relaxations appear to be different in both nanoalloys. Ab initio calculations of the atomic relaxation shed light on these experimental results, showing that the wide distance distribution in Co sub-lattice should strongly alter the magnetic anisotropy of CoPt nanoparticles.
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Dates and versions

hal-03736439 , version 1 (25-07-2022)

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Alexandre Tamion, Florent Tournus, Nils Blanc, Arnaud Hillion, O Proux, et al.. Comparison of magnetic anisotropy and structural properties in chemically ordered CoPt and FePt nanoparticles. Physical Review B, 2022, 106 (10), pp.104420. ⟨10.1103/PhysRevB.106.104420⟩. ⟨hal-03736439⟩
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