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Fluctuation-driven magnetic hard-axis ordering in metallic ferromagnets

Pedder, CJ; Krüger, F; Green, AG; (2014) Fluctuation-driven magnetic hard-axis ordering in metallic ferromagnets. Physical Review Letters , 113 (14) , Article 147001. 10.1103/PhysRevLett.113.147001. Green open access

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Abstract

We demonstrate that the interplay between soft electronic particle-hole fluctuations and magnetic anisotropies can drive ferromagnetic moments to point along a magnetic hard axis. As a proof of concept, we show this behavior explicitly for a generic two-band model with local Coulomb and Hund's interactions, and a spin-orbit-induced easy plane anisotropy. The phase diagram is calculated within the fermionic quantum order-by-disorder approach, which is based on a self-consistent free-energy expansion around a magnetically ordered state with unspecified orientation. Quantum fluctuations render the transition of the easy-plane ferromagnet first-order below a tricritical point. At even lower temperatures, directionally dependent transverse fluctuations dominate the magnetic anisotropy and the moments flip to lie along the magnetic hard axis. We discuss our findings in the context of recent experiments that show this unusual ordering along the magnetic hard direction.

Type: Article
Title: Fluctuation-driven magnetic hard-axis ordering in metallic ferromagnets
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.113.147001
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.113.147001
Language: English
Additional information: Copyright © 2014 American Physical Society.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: https://discovery.ucl.ac.uk/id/eprint/1449844
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