马丁路德哈勒大学

发布时间：2018-04-23

浏览次数：518次

Two PhD positions in Ultrafast spintronics and spin dynamics

PhD project 1:

In project B02 of the new collaborative research center TRR227 on ultrafast spin dynamics cutting-edge ultrafast electrical measurements on metallic nano-spin-valves will be performed. The PhD position described here covers two major research areas. On the one hand the electrical response of nanopatterned metallic spin-valves under bias to ultrafast optical demagnetization will be measured. Triggered by femtosecond laser pulses one of the ferromagnetic layers in a GMR geometry will be demagnetized. For the first time we will investigate the electrical response of devices on the sub 10 ps timescale, in order to show whether magnetooptic response and electrical signal are following the same physical laws. On the other hand we will investigate giant magnetoresistance approaching the 100 GHz limit. At these very high frequencies GMR can no longer be described as a stationary phenomenon. The timescales of current reversal ultimately approach the times that spins need to diffuse through the layers and can finally lead to a sign reversal of giant magneto resistance. Combining both ultrafast optics and ultrafast electrical measurements the project will lay the groundwork for the application of spintronics, especially GMR, in future ultrafast electronics beyond the 100 GHz limit. A candidate should ideally be experienced in at least one of the areas of deposition and nanopatterning of metallic films, high frequency electrical characterization using vector network analysers or sampling oscilloscopes, or ultrafast magneto optics.

PhD project 2:

The second PhD candidate will fabricate and investigate spin-Hall nano-oscillators. These devices are based on spin precession which is caused by spin currents induced by the inverse spin Hall effect [1]. We want to investigate metallic structures as well as multilayers based on yttrium iron garnet. The layers are deposited using either magnetron sputtering or pulsed laser deposition and patterned by electron beam lithography and dry etching. The work includes the sample fabrication and characterization.  The applicant should have an excellent master’s degree or diploma in physics (or an equivalent qualification) and good knowledge in solid state physics. Experience in at least one of the fields of PLD, electron beam lithography and high frequency spin dynamics is recommended but not mandatory.

[1]A.A. Awad et al. Nature Physics 13, 292 (2017)

The group for nanostructured materials focusses on spin transport, spin dynamics, novel materials and high resolution lithography. Sample fabrication is done in the cleanroom facilities of the university (200 m2/class 100, 400 m2/class 10000) where all necessary state-of-the-art equipment is available for thin film deposition and nano-patterning.

The half time positions (50%) which should start as soon as possible are initially limited to three years but may be extended up to four years. The salary will be determined up to pay grade 13 TV-L (50%) depending on the assigned tasks and personal qualifications.

Applications should mention the preferred PhD project and include a cover letter, CV, list of publications, and the names of references.

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