Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 51: Magnetism Poster B

MA 51.3: Poster

Donnerstag, 4. April 2019, 15:00–18:00, Poster C

Ultrafast Spintronic Devices — •Bikash Das Mohapatra¹ and Georg Schmidt^1,2 — ¹Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, Von-Danckelmann-Platz 3, D-06120 Halle, Germany — ²Interdisziplinäres Zentrum für Materialwissenschaften, Martin-Luther-Universität Halle-Wittenberg, Heinrich-Damerow-Straße 4, D-06120 Halle, Germany

Spin valves based on GMR (Giant Magnetoresistance) are to be investigated in the Terahertz frequency range. The GMR structures are fabricated using sputter deposition and spin valve stacks are formed by e-beam lithography and ion beam etching with end-point detection. These structures will be used for magnetoresistance measurements and optimization for ultrahigh frequency AC transport experiments. It was shown earlier that the magnetoresistance becomes frequency dependent and can even change its sign due to time dependent spin accumulation in spacer layers at high frequencies which would be relevant for Spintronic application in the THz regime. Furthermore, it is planned to integrate the structures into Coplanar waveguides and to study the electrical response to optical demagnetization on the picosecond timescale. The measurements will be done using a VNA (vector network analyzer). This study can lead to new insights into the ultra high frequency response of GMR structures and to an extension of the Valet Fert Model to very high frequencies.