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

Aigu L. Lin, J. N B Rodrigues, Chenliang Su, M. Milletari, Kian Ping Loh, Tao Wu, Wei Chen, A. H Castro Neto, Shaffique Adam, Andrew T. S. Wee

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


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 m2/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. © 2015 Scientific Reports.
Original languageEnglish (US)
JournalScientific Reports
Issue number1
StatePublished - Jun 23 2015

ASJC Scopus subject areas

  • General

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