Abstract
The exchange bias phenomena of phase-separated Nd1-xSrxCoO3(x=0.10, 0.15) samples were systematically investigated in this paper. The samples were prepared using conventional solid state reaction method. When the NdSrCoO samples cooled down in magnetic field below freezing temperature, the hysteresis loops shifted along the magnetic field axis. Moreover, exchange bias of Nd1-xSrxCoO3 is strongly dependent on the field and the temperature. The influence of magnetic field on the relative ratio of the coexisting phases may be responsible for these behaviors. Therefore, our study confirmed that in phase-separated system, the exchange coupling at the interface between the ferromagnetism clusters and the spin glass regions may induce interfacial exchange anisotropy.
Highlights
When samples with a ferromagnetic-antiferromagnetic (FM-AFM) interface cool down in the magnetic field from above Neel temperature, hysteresis loops shift towards the magnetic field axis when the hysteresis loops are measured under the Neel temperature, namely the exchange bias
Exchange bias is induced by unidirectional anisotropy caused by exchange-coupling at the FM-AFM interface
For the condition of field-cooled (FC), hysteresis tests were conducted on samples (x=0.10) at 10 K and 25 K to analyze the causes of exchange bias
Summary
When samples with a ferromagnetic-antiferromagnetic (FM-AFM) interface cool down in the magnetic field from above Neel temperature, hysteresis loops shift towards the magnetic field axis when the hysteresis loops are measured under the Neel temperature, namely the exchange bias. Exchangecoupling at ferromagnetic and spin glass interface induces exchange bias [16,17,18]. This thesis studied the exchange bias of cobalt oxide Nd1xSrxCoO3 (x=0.10, 0.15). It is considered that cobalt oxides are composed of ferromagnetic cluster, nonferromagnetic matrix and spin glass, and that spin glass exists between ferromagnetic cluster and non-ferromagnetic matrix, forming an interface around ferromagnetic cluster [19,20,21]. Under such circumstance, phase separation of Nd1xSrxCoO3 causes the formation of a ferromagnetic /spin glass interface. Magnetic testing adopts the physical properties measurement system (PPMS) of the Quantum Design
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