Regensburg 2004 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 44: Poster II
HL 44.15: Poster
Donnerstag, 11. März 2004, 16:30–19:00, Poster A
Semiconductor–Metal Hybrid Structures as Optimized Magnetic–Field Sensors — •Matthias Holz1,2, Oliver Kronenwerth3, Matthias Hoener3, and Dirk Grundler3 — 1I. Institut für Theoretische Physik, Universität Hamburg — 2FB Elektrotechnik, Universität der Bundeswehr Hamburg — 3Institut für Angewandte Physik, Universität Hamburg
Recent experimental results show that non–magnetic semiconductor–metal hybrid structures can exhibit a very large magnetoresistance effect, the so–called Extraordinary Magnetoresistance (EMR) effect. Such structures do not suffer from the drawbacks of current magnetic–field sensors based on the giant magnetoresistance (GMR) or tunnel magnetoresistance (TMR) effect, like magnetic noise or demagnetisation. In addition to its physical significance, the EMR effect is thus interesting for improved magnetic–field sensors [1-3].
In our work, we study the EMR effect theoretically by means of the finite–element method. We show how hybrid structures can be optimized for magnetic–field sensors and, in particular, for read heads. As a result, we find several design rules for EMR read heads and show that magnetoresistance effects of more than 100 % are realistic. This renders this kind of hybrid structures promising for future applications.
We gratefully acknowledge financial support from the DFG via SFB 508 and from BMBF via 01BM905.
[1] S. A. Solin, et al., Science 289, 1530 (2000).
[2] M. Holz, et al., Phys. Rev. B 67, 195312 (2003).
[3] M. Holz, et al., Appl. Phys. Lett. 83, 3344 (2003).