Abstract
Exchange bias (EB) is investigated in singly inverted $\text{FeO}/{\text{Fe}}_{3}{\text{O}}_{4}$ core-shell nanocrystals by vibrating sample magnetometry. A horizontal and vertical shift of the field-cooled (FC) hysteresis loop with respect to the zero-field-cooled (ZFC) hysteresis loop is observed below the blocking temperature of EB $({T}_{B}^{\text{EB}}\ensuremath{\approx}{T}_{N})$. An enhancement of the superparamagnetic blocking temperature $({T}_{B}^{\text{SP}}\ensuremath{\approx}190\text{ }\text{K})$ with respect to the expected value is observed from the ZFC/FC measurement of $m(T)$. Furthermore, the value of ${T}_{B}^{\text{SP}}$ is nearly constant for applied fields ranging from 25 to 200 Oe as a result of the exchange coupling at the antiferromagnetic/ferrimagnetic interface.
Published Version
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