DPG Phi
Verhandlungen
Verhandlungen
DPG

Dresden 2006 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

MA: Magnetismus

MA 7: Micro- and Nanostructured Magnetic Materials I

MA 7.11: Talk

Monday, March 27, 2006, 17:30–17:45, HSZ 03

Arrays of magnetic nano particles using self-organised semiconductor surfaces — •Nikolai Mikuszeit1, Miguel Angel Niño1, Julio Camarero1, Juan José de Miguel1, Rodolfo Miranda1, Christian Hofer2, Christian Teichert2, Thomas Bobek3, and Stepan Kyrsta41Dpto. Física de la Materia Condensada, Universidad Autónoma de Madrid, E-28049 Madrid, Spain — 2Institut für Physik, Montanuniversität, A-8700 Leoben, Austria — 3Institut für Halbleitertechnik, RWTH-IHT, D-52056 Aachen, Germany — 4Lehrstuhl für Werkstoffchemie, RWTH-MCh, D-52056 Aachen, Germany

The self-organisation of semiconductor surfaces has been used to create arrays of magnetic nano particles [1]. The surface structure and magnetic properties are amongst others investigated by AFM and MOKE. In a first approach we use strain induced self-assembled SiGe surfaces as growth templates. Shadow deposition onto these surfaces results in elongated magnetic dots [2]. In a second approach the formation of self-organised hexagonal dots of GaSb surfaces, due to Ar+ sputtering, are used [3]. Deep trenches between the dots cut an embedded magnetic layer into discs. Both systems show dipolar coupling between the dots. To overcome the dipolar coupling a high magnetic anisotropy energy is required. In order to enhance the magnetic anisotropy, CoPt-multilayers with perpendicular anisotropy and Co/CoO in-plane systems are studied. The dot magnetic behaviour is compared to micromagnetic simulations.

[1] C. Teichert Appl. Phys. A 76, 653 (2003)

[2] A. M. Mulders et al. Phys. Rev. B , 71, 214422 (2005)

[3] S. Facsko et al. Science 285, 1551 (1999)

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2006 > Dresden