Thermoinduced magnetization in nanoparticles of antiferromagnetic materials.
We show that there is a thermoinduced contribution to the magnetic moment of nanoparticles of antiferromagnetic materials. It arises from thermal excitations of the uniform spin-precession mode, and it has the unusual property that its magnitude increases with increasing temperature. This has the consequence that antiferromagnetism is nonexistent in nanoparticles at finite temperatures and it explains magnetic anomalies, which recently have been reported in a number of studies of nanoparticles of antiferromagnetic materials.
Mørup
Steen
S
Department of Physics, Building 307, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark.
Frandsen
Cathrine
C