Berlin 2012 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MA: Fachverband Magnetismus

MA 39: Micro- and Nanostructured Magnetic Materials I

MA 39.9: Vortrag

Donnerstag, 29. März 2012, 11:45–12:00, EB 202

Magneto-static interaction of single NiFe nanostructures — •Philipp Staeck, Mahmoud Reza Rahbar Azad, André Kobs, Daniel Stickler, Björn Beyersdorff, Hendrik Spahr, Robert Frömter, and Hans Peter Oepen — Inst. für Angewandte Physik, Universität Hamburg, Jungiusstr. 11, 20355 Hamburg, Germany

The magneto-static interaction of submicron Ni80Fe20 rectangles (aspect ratio 2:1) has been investigated by means of magnetotransport measurements using anisotropic magneto resistance (AMR). The structures were carved into a Cr(10nm)/Ni80Fe20(20nm)/Pt(2,5nm) trilayer utilizing a focused ion beam (FIB). The material around the rectangles has been rendered via ion milling. Microcircuits are milled by FIB that allow to contact electrically an individual element via a micromanipulator [1]. For this work structure sizes down to 300 nm x 600 nm have been investigated. This one-step structuring approach in combination with a magneto-resistive measuring setup (sensitivity of ΔR/R=10⁻⁶) was utilized to measure the magnetic energy of micro-magnetic states of single, isolated rectangle obtaining flux closure structures, like Landau state [2]. Recently, it has been shown that rectangles with flux closure structure can magneto statically interact [3]. We have varied the distance between rectangles in an array and measured the energy change of a single element. The strength of the magneto-static interaction between rectangles revealing flux closure domain pattern has been quantified. [1] Daniel Stickler et al., Rev. Sci. Instr. 79, 103901 (2008), [2] André Kobs et al., Phy. Rev. B 80, 134415 (2009), [3] Sebastian Hankemeier et al., PRL 103, 147204 (2009)