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Lecture Andrea Scaramucci

Roster

WhenWhere
24 September 2012 FWN-Building 5115.0013, Nijenborgh 4, 9747 AG, Groningen
Speaker: Dr. Andrea Scaramucci
Affiliation: ETH Zürich, Switzerland
Title: Linear Magnetoelectric effect by orbital magnetism
Date: Mon Sep 24, 2012
Start: 14.00
Location: FWN-Building 5115.0013
Host: Maxim Mostovoy
Telephone: +31 50 363 3419

Abstract

The linear magnetoelectric effect is the linear induction of a static magnetization (electric polarization) by an applied static electric (magnetic) field. Using symmetry analysis and ab initio calculations we show that, in addition to mechanisms involving magnetic moments of spins, such an effect can originate from the response of orbital magnetic moment to polar distortions induced by an applied electric field. Considering members of the transition metal phosphates series (LiMPO4, M=Mn, Fe, Co, Ni) as model compounds, we show that spin-orbit coupling partially lifts the quenching of 3d orbitals and causes small orbital magnetic moments at the magnetic ions sites. An applied electric field modifies the sizes of these orbital magnetic moments and results in a net magnetization. Furthermore, we discuss the link between such mechanism and the electric field dependence of magnetocrystalline anisotropy.

 

 

Last modified:22 October 2012 2.30 p.m.