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


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.

SUBMITTER: Lin AL 

PROVIDER: S-EPMC4477240 | biostudies-literature | 2015 Jun

REPOSITORIES: biostudies-literature

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

Lin Aigu L AL   Rodrigues J N B JN   Su Chenliang C   Milletari M M   Loh Kian Ping KP   Wu Tom T   Chen Wei W   Neto A H Castro AH   Adam Shaffique S   Wee Andrew T S AT  

Scientific reports 20150623


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 temperat  ...[more]

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