Volume 87, Number 6, September 2009
Article Number 67004
Number of page(s) 5
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
Published online 01 October 2009
EPL, 87 (2009) 67004
DOI: 10.1209/0295-5075/87/67004

Anapole moment and spin-electric interactions in rare-earth nanoclusters

A. I. Popov1, 2, D. I. Plokhov1 and A. K. Zvezdin1, 3

1   A.M. Prokhorov General Physics Institute of Russian Academy of Sciences 38 Vavilov Str. 119991 Moscow, Russia
2   Moscow Institute of Electronic Technology - 5 Pas. 4806, 124498 Zelenograd, Moscow, Russia
3   Ikerbasque Foundation for Science - 48011 Bilbao, Spain, EU

received 27 August 2009; accepted in final form 15 September 2009; published September 2009
published online 1 October 2009

Spin-electric interactions and magnetoelectric properties of triangular rare-earth molecular nanoclusters are investigated by the example of ${\rm Dy}_{3}$. The effective spin-electric Hamiltonian is derived on the base of a developed quantum-mechanical model of the cluster spin structure. It is shown that a toroidal (anapole) moment is induced in such clusters with magnetic field exceeding some threshold value or with crossed electric and magnetic fields (or an electric current). Due to the considerable relaxation time of the state with non-zero toroidal moment, it is possible to observe the non-equilibrium quantum linear magnetoelectric effect.

75.80.+q - Magnetomechanical and magnetoelectric effects, magnetostriction.
36.40.-c - Atomic and molecular clusters.

© EPLA 2009