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Anisotropy of antiferromagnetic 180A degrees domains in magnetoelectric LiMPO4 (M = Fe, Co, Ni)

TitleAnisotropy of antiferromagnetic 180A degrees domains in magnetoelectric LiMPO4 (M = Fe, Co, Ni)
Publication TypeJournal Article
Year of Publication2009
AuthorsZimmermann AS, Van Aken BB, Schmid H, Rivera JP, Li J, Vaknin D, Fiebig M
Journal TitleEuropean Physical Journal B
Volume71
Pages355-360
Date Published10/01
ISBN Number1434-6028
Accession NumberISI:000271029200009
Keywordslicopo4, linipo4, weak ferromagnetism
Abstract

An unusual variety of magnetic, magnetoelectric and ferrotoroidic properties was observed in the lithium-orthophosphates LiMPO4 with M = Fe, Co, Ni by optical second harmonic generation. In spite of a largely similar magnetic and crystallographic structure the compounds exhibit pronounced differences in the topology of antiferromagnetic 180A degrees domains. In LiCoPO4 the antiferromagnetic domains coexist with ferrotoroidic, i.e., magnetic vortex domains. For LiNiPO4 it was shown that the weak ferrimagnetic moment of the LiMPO4 compounds along the spin direction is rigidly coupled to the AFM order parameter so that the sign of the magnetoelectric effect is reversed by a magnetic field only. Further effects of a static magnetic field on the system are discussed.
URL<Go to ISI>://000271029200009
DOI10.1140/Epjb/E2009-00223-3