Ferromagnetism in bulk Co-Zn-O

On the origin of high-temperature ferromagnetism in the low-temperature-processed Mn-Zn-O system.

The recent discovery of ferromagnetism above room temperature in low-temperature-processed MnO(2)-ZnO has generated significant interest. Using suitably designed bulk and thin-film studies, we demonstrate that the ferromagnetism in this system originates in a metastable phase rather than by carrier-induced interaction between separated Mn atoms in ZnO. The ferromagnetism persists up to approxim...

ROOM TEMPERATURE FERROMAGNETISM IN THE Mn-Zn-O SYSTEM: A NEW INTERPHASE MAGNETISM

1 Instituto de Magnetismo Aplicado (RENFE-UCM-CSIC), P.O. Box 155, 28230 Las Rozas, Madrid, Spain. 2 Depto. Física de Materiales, UCM, 28040 Madrid, Spain. 3 Instituto de Microelectrónica de Madrid, CNM-CSIC, Isaac Newton 8 PTM, 28760 Tres Cantos, Madrid, Spain. 4 Instituto de Cerámica y Vidrio, CSIC, Cantoblanco 28049 Madrid, Spain. 5 Depto. de Química Inorgánica I, UCM, 28040 Madrid, Spain. 6...

Carrier-mediated ferromagnetism in N codoped (Zn,Mn)O (1010) thin films

Interface double-exchange ferromagnetism in the Mn-Zn-O system: new class of biphase magnetism.

In this Letter, we experimentally show that the room temperature ferromagnetism in the Mn-Zn-O system recently observed is associated with the coexistence of Mn(3+) and Mn(4+) via a double-exchange mechanism. The presence of the ZnO around MnO(2) modifies the kinetics of MnO(2)-->Mn(2)O(3) reduction and favors the coexistence of both Mn oxidation states. The ferromagnetic phase is associated wi...

Carrier-mediated ferromagnetism in N codoped (Zn,Mn)O (101Â ̄0) thin films