Exchange bias effect in spin glass CoCr2O4 nanoparticles

摘要: Abstract CoCr 2 O 4 nanoparticles are about 5.4 nm in diameter synthesized by a hydrothermal technique. Magnetization measurements reveal that the exhibit spin glass behavior below transition temperature. Signature of memory effect is clear reheating curve where step-like shape increasing with increase temperature recovered after cooling process. Magnetic relaxation performed to prove effect. Ageing also detected verify behavior. As decreases 5 K, which far temperature, exchange bias can be observed clearly accompanied shift field-cooled hysteresis loop. particle size 5.4 nm, appears due increased disorder The phase providing pinning force from some frozen spins rotatable gives key explain effects.