Abstract
particles, surface modified with NiO crystallites, form a unique nanocomposite that points to how to tune strong interfacial exchange coupling. We find that migrates into the octahedral sites of the nanoparticle surface, and this -like layer permits effective magnetic coupling of Ni and Fe sites that strengthens the interface exchange. A large increase in coercivity coinciding with a loss of exchange bias is achieved by this strong interfacial coupling that results in a moment reversal in the NiO with the . This work reveals the importance of intermixing in, and possibility to use, such an exchange coupling regime to alter substantially the coercivity and hence control an important property of exchange-coupled nanocomposite magnets.
1 More- Received 15 May 2017
- Revised 19 June 2017
DOI:https://doi.org/10.1103/PhysRevB.96.024447
©2017 American Physical Society