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Dresden 2006 – scientific programme

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MA: Magnetismus

MA 33: Spin-Dynamics, Magnetization Reversal III

MA 33.6: Talk

Thursday, March 30, 2006, 16:30–16:45, HSZ 403

Bloch line generation in cross-tie walls by fast magnetic field pulses — •Andreas Neudert, Jeffrey McCord, Rudolf Schäfer, and Ludwig Schultz — IFW Dresden, Postfach 270116, 01171 Dresden

In ferromagnetic films with an intermediate thickness of 30 to 90 nm cross-tie walls are observed. They consist of a sequence of circular and cross Bloch lines (also called vortex and antivortex) that are connected by 90 Neel walls. Additional 90 Neel walls emerge from the cross Bloch lines and form the "legs" of the cross-tie wall. We investigated the influence of a pulsed magnetic field (amplitude 400 A/m, width 1.2 ns) applied perpendicular to the wall plane onto a constrained cross-tie wall in a 80 µm x 160 µm permalloy rectangle of 50 nm thickness. The equilibrium cross-tie spacing of about 15 µm is reached after demagnetizing the sample with a magnetic ac-field. By applying the pulsed magnetic field with a repetition rate of 23 MHz additional Bloch lines are created and the cross-tie spacing decreases to about 5 µm. This Bloch line generation is not triggered by the repetition rate of the pulsed magnetic field as shown by using a low repetition rate pulse train of 0.2 Hz but by the fast rise time of the field pulses. A comparison with micromagnetic calculations will be given.

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