Regensburg 2007 – wissenschaftliches Programm

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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 15.34: Poster

Dienstag, 27. März 2007, 15:00–19:00, Poster A

Magnetoresistive effects in ultrathin permalloy films — •Stephen Krzyk, Mathias Kläui, and Ulrich Rüdiger — Fachbereich Physik, Universität Konstanz, 78457 Konstanz

Inspired by the successful industrial application of the giant magnetoresistance effect (GMR), magnetoresistance properties of nanoscale structures are the subject of intense research. Recent experiments [1] have shown that decreasing the cross section of a nanocontact leads to a significantly increased magnitude of the anisotropic magnetoresistance.

A possible approach to small contact sizes are ultrathin films near the percolation threshold. We investigate magnetotransport through permalloy (Ni₈₀Fe₂₀) films grown in between the gaps of Au leads. Permalloy films in the monolayer range were deposited via molecular beam epitaxy in ultra high vacuum conditions. A magnetic field of up to 100 mT was applied in the sample plane, and the conductance of the contact region was measured during depostion as a function of the field angle.

[1] K. I. Bolotin et al., Phys. Rev. Lett. 97, 127202 (2006)