Regensburg 2007 – scientific programme
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MA: Fachverband Magnetismus
MA 15: Poster:ThinFilms(1-33),Transp.(34-49),ExchBias(50-56),
Spindynamics(57-70),Micro-nanostr.Mat.(71-82),
Particles/Clust.(83-88), Mag.Imag./Surface(89-96),
Spinelectronics(97-109), Theory/Micromag.(110-116),
Spinstruct/Phasetr.(117-128),Magn.Mat.(129-139),
Aniso.+Measuring(140-145), MolMag.(146-152),
MSMA(153-156)
MA 15.33: Poster
Tuesday, March 27, 2007, 15:00–19:00, Poster A
Electric-Field Induced Modification of Magnetism in Thin Film Ferromagnets — Martin Weisheit1,2, •Sebastian Fähler1,2, Alain Marty3, Yves Souche1, Christiane Poinsignon4, and Dominique Givord1 — 1Laboratoire Louis Néel, CNRS, Grenoble, France — 2IFW Dresden, Germany — 3DRFMC / SP2M / NM, CEA Grenoble, France — 4LEPMI / ENSEEG, Saint Martin d'Hères, France
A large electric field at the surface of a ferromagnetic metal is expected to appreciably change the electron density. In particular, the intrinsic magnetic properties, which commonly are regarded as fixed material constants, will be affected. This requires, however, that the surface has a strong influence on the material*s properties, as is the case in ultrathin films. We show that the magnetocrystalline anisotropy of ordered FePt and FePd intermetallic compounds can be reversibly modified by an applied electric field when immersed in an electrolyte. A voltage change of -0.6 V on 2 nm thick films altered the coercivity by -4.5% and +1% in FePt and FePd, respectively. The modification of the magnetic parameters was attributed to a change in the number of unpaired d-electrons in response to the applied electric field. Our device structure is general and should be applicable for characterisation of other thin film magnetic systems.
Science, forthcoming 19.1.2007