Temperature induced magnetization reversal in SrRuO₃

Temperature driven magnetization reversal under zero field cooled (ZFC) process in SrRuO₃ is observed at very low magnetic field (50 Oe). Large magnetic field (> 1000 Oe) is required to align the spontaneous magnetization in the direction of applied field. The compensation temperature (Tcomp) decreases and the peak in ZFC shifts towards lower temperature with increase of magnetic field. A reversible bistable magnetic state can be controlled by changing the magnitude of magnetic field in the same direction below Curie temperature. Intrinsic negative spin polarization, high magnetocrystalline anisotropy constant and random orientation of easy axis are key points in magnetization reversal of SrRuO₃. The normal and inverse magnetocaloric effect (MCE) at low magnetic field limit (0.1 T and 1 T) coexist in a single compound and only normal MCE is observed at higher magnetic field (2 T - 5 T). The maximum value of magnetic entropy (ΔS_M) at magnetic field 5T is 1.8 JKg^-1K^-1. Switching behavior and large magnetocaloric effect indicates that SrRuO₃ may be used for multifunctional devices. (author)