title: Magnetoelectric control of superparamagnetism.
abstract: Here we demonstrate electric-field induced magnetic anisotropy in a multiferroic composite containing nickel nanocrystals strain coupled to a piezoelectric substrate. This system can be switched between a superparamagnetic state and a single-domain ferromagnetic state at room temperature. The nanocrystals show a shift in the blocking temperature of 40 K upon electric poling. We believe this is the first example of a system where an electric field can be used to switch on and off a permanent magnetic moment.
authors: Department of Materials Science and Engineering, UCLA, Los Angeles, California 90095, United States.
authors: Hyungsuk K D
authors: HK
authors: Kim
authors: Laura T
authors: LT
authors: Schelhas
authors: Scott
authors: S
authors: Keller
authors: Joshua L
authors: JL
authors: Hockel
authors: Sarah H
authors: SH
authors: Tolbert
authors: Gregory P
authors: GP
authors: Carman
mesh_terms: D008280:Magnetics; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles