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Magnetic oxide nanoparticles: Large scale preparation, magnetism, and core/shell architectures

Ram Seshadri 

University of California, Santa Barbara, CA 93106, United States


I will review current high temperature methods of preparing capped magnetic oxide nanoparticles - mostly with the spinel structure - using solvothermal chemistry or high-temperature solvents, and the thermolysis of precursors. The properties of the materials so obtained have been carefully characterized from the viewpoint of structure and magnetism, including using synchrotron and neutron diffraction. The magnetic properties of high quality nanocrystals depend strongly on inter-particle contacts. No evidence for a magnetic "dead-layer" is found in high quality/high temperature preparations, as opposed to aqueous solution preparations. The possibility of core/shell architectures, including exchange biased and exchange spring magnets are explored, as are novel systems for magnetocapacitance studies.


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Presentation: Invited at E-MRS Fall Meeting 2007, Symposium A, by Ram Seshadri
See On-line Journal of E-MRS Fall Meeting 2007

Submitted: 2007-04-02 01:40
Revised:   2009-06-07 00:44