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.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Lin AL,Rodrigues JN,Su C,Milletari M,Loh KP,Wu T,Chen W,Neto AH,Adam S,Wee ATdoi
10.1038/srep11430subject
Has Abstractpub_date
2015-06-23 00:00:00pages
11430issn
2045-2322pii
srep11430journal_volume
5pub_type
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