Dresden 2017 – scientific programme
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MA: Fachverband Magnetismus
MA 55: Thin Films: Magnetic Anisotropy
MA 55.1: Talk
Thursday, March 23, 2017, 15:00–15:15, HSZ 101
New magnetic anisotropy control in thin film multilayers for sensing applications — •Svenja Willing1, Kai Schlage1, Lars Bocklage1,2, Guido Meier2,3, and Ralf Röhlsberger1,2 — 1Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany — 2The Hamburg Centre for Ultrafast Imaging, Hamburg, Germany — 3Max-Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany
Magnetic field sensors are frequently used in today's automotive control, industrial process management, and information technology. Sensors based on the giant magnetoresistance are small, low-cost, and easy to produce. They can be as simple as a sandwich of two magnetic layers separated by a non-magnetic spacer layer. Exposing such a trilayer to a magnetic field influences the relative orientation of magnetization in the layers which can be detected as a change in electrical resistance. Recently, the magnetic and magneto-resistive properties of such multilayers stacks were tuned by deposition at oblique incidence angles [1]. The induced shape anisotropy enables full control over each individual layer's coercivity and preferred magnetic orientation without the limitations of interlayer exchange or exchange-biased pinning. This allows for a versatile, individual tailoring of multilayer functionalities to adapt the sensor to the needs of an application. We show how microstructuring influences the magnetic and magneto-resistive properties of the multilayer devices.
[1] K. Schlage, L. Bocklage, D. Erb, J. Comfort, H.-C. Wille, R. Röhlsberger, Adv. Funct. Mater. 2016, 26, 7423-7430.