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Reference : UMR137-VINCRO-008
Workplace : PALAISEAU
Date of publication : Monday, January 11, 2021
Type of Contract : FTC Scientist
Contract Period : 12 months
Expected date of employment : 1 March 2021
Proportion of work : Full time
Remuneration : between 2400 and 2750 euros bruto per month
Desired level of education : 5-year university degree
Experience required : 1 to 4 years
The objective will be to study new approaches to increase spin transfer torques in multilayers containing magnetic skyrmions. Classically the charge-spin conversion is obtained by spin Hall effect in a heavy metal film in contact with a magnetic film or by Edelstein-Rashba effect at an interface. In this project, the aim will be to investigate experimentally the generation of new sources of charge-spin conversion either directly in a magnetic film with a magnetization gradient for example or in interfaces without heavy metal but with strong orbital moments. The next objective will be to design and fabricate functional nanodevices based on skyrmions using a combination of optical (conventional or laser) and electron beam lithography techniques that include innovative solutions for increasing spin transfer torques. These optimized skyrmion-based race-track devices will then be tested and their performance compared to the state of the art.
- Sputtering growth and optimization of magnetic multilayer systems including optimized spin transfer sources.
- Determination of spin transfer torques and comparison with theoretical predictions.
- Design and fabrication of nanostructures by optical, laser and electronic lithography.
- Imaging of skyrmions by MFM or NV magnetic microscopy.
- Experimental study of skyrmion displacements combining injection of ultra-short current pulses (10 ns) and magnetic imaging by Magnetic Force Microscopy.
- Test of the different functions in elaborated nanodevices: writing, control and detection.
The candidates must:
- have some very strong expertise in all the mentioned nanofabrication techniques (required)
- have extensive knowledge of nanomagnetism and spin transport, ideally with experience in the magnetic properties of ultrathin and magnetic multilayer films (required)
- have knowledge of Magnetic Imaging by Magnetic Force Microscopy (desired)
- have a good knowledge of the bibliography on chiral magnetic configurations in spintronic systems
- have a very good level writtring / speaking in English
- be able to synthesize its results and present them in public at conferences and seminars.
- to be able to work in a team
- to be able to participate in the supervision of students
The postdoctoral project will take place mainly at the CNRS/Thales Joint Research Unit (UMPhy) in Palaiseau, France. This work is funded under the US TEE project for which meetings every 3 months are organized with other partners and a meeting in the US every 6 months with the funding agency.
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