Low Temperature Physics: 40, 156 (2014); https://doi.org/10.1063/1.4865563
Физика Низких Температур: Том 40, Выпуск 2 (Февраль 2014), c. 200-204    ( к оглавлению , назад )

Exchange bias associated with phase separation in the Nd2/3Ca1/3MnO3 manganite

Elena Fertman, Sergiy Dolya, and Vladimir Desnenko

B. Verkin Institute for Low Temperature Physics and Engineering National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
E-mail: fertman@ilt.kharkov.ua

Marcela Kajňaková and Alexander Feher

Institute of Physics, Faculty of Science, P. J. Šafárik University in Košice, Faculty of Science, Park Angelinum 9, Košice 04154, Slovakia

Received July 18, 2013

Аннотация

The exchange bias (EB) phenomenon has been found in Nd2/3Ca1/3MnO3 perovskite. The phenomenon manifests itself as a negative horizontal shift of magnetization hysteresis loops. The EB phenomenon is evident of an interface exchange coupling between coexisting antiferromagnetic (AFM) and ferromagnetic (FM) phases and confirms the phase separated state of the compound at low temperatures. The EB effect is found to be strongly dependent on the cooling magnetic field and the temperature, which is associated with the evolution of spontaneous AFM–FM phase separated state of the compound. Analysis of magnetic hysteresis loops has shown that ferromagnetic moment MFM originating from the FM clusters saturates in a relatively low magnetic field about H ~ 0.4 T. The obtained saturation value MFM (1 T) ~ 0.45 μB is in a good agreement with our previous neutron diffraction data.

PACS: 75.47.Lx Manganites;
PACS: 71.70.Gm Exchange interactions;
PACS: 79.60.Jv Interfaces; heterostructures; nanostructures;
PACS: 75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects.

Ключевые слова: exchange bias; spontaneous phase separation; interface exchange coupling.