Regensburg 2016 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 17: Poster Session I
MA 17.17: Poster
Dienstag, 8. März 2016, 09:30–12:30, Poster B1
Field working window of magnetic domain wall sensors — •Benjamin Borie1,2, Johannes Paul1, Mathias Kläui2, and Hubert Grimm1 — 1Sensitec GmbH, 55131 Mainz, Germany — 2Institut für Physik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
The potential of timeless data storage with very low power provides a certain advantage to magnetic domain wall based sensors [1] as technological solutions. Still the industry remain unable to offer reliable devices [2]. The stochasticity of the domain wall behaviour concerning its pinning and depinning events as well as the complexity of the manufacturing constitute the major issues for the technology to reach the market. Sensors probe a certain field window of work. The failure events such as an unwanted nucleation and a pinning of a domain wall have to be outside this window. The study reports the influence of roughness, crystallisation, shape and material stacks on the magnetic operating window of a free layer of a multi-turn sensor driven by rotating external field. The roughness and the crystallite sizes are likely to create a potential landscape that increase the pinning and reduces the nucleation field. NiFe, CoFe and CoFeB free layers can be fabricated and investigated using transport measurements such as the GMR effect currently used by the sensor and MOKE microscopy measurements to ascertain an understanding of the physics involved. [1] M. Diegel et. al., IEEE Trans. Magn. 45, 3792 (2009) [2] A. Bisig et al., Nat. Commun. 4, 2328 (2013).