Tunable room-temperature ferromagnet using an iron-oxide and graphene oxide nanocomposite

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Abstract

Magnetic materials have found wide application ranging from electronics and memories to medicine. Essential to these advances is the control of the magnetic order. To date, most room-temperature applications have a fixed magnetic moment whose orientation is manipulated for functionality. Here we demonstrate an iron-oxide and graphene oxide nanocomposite based device that acts as a tunable ferromagnet at room temperature. Not only can we tune its transition temperature in a wide range of temperatures around room temperature, but the magnetization can also be tuned from zero to 0.011 A m 2 /kg through an initialization process with two readily accessible knobs (magnetic field and electric current), after which the system retains its magnetic properties semi-permanently until the next initialization process. We construct a theoretical model to illustrate that this tunability originates from an indirect exchange interaction mediated by spin-imbalanced electrons inside the nanocomposite.

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Lin, A. L., Rodrigues, J. N. B., Su, C., Milletari, M., Loh, K. P., Wu, T., … Wee, A. T. S. (2015). Tunable room-temperature ferromagnet using an iron-oxide and graphene oxide nanocomposite. Scientific Reports, 5. https://doi.org/10.1038/srep11430

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