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PhD thesis (F/M): Scanning tunnelling microscopy investigation of low energy magnetic excitations

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Français - Anglais

Date Limite Candidature : mardi 10 août 2021

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General information

Reference : UMR7588-MARHER-001
Workplace : PARIS 05
Date of publication : Tuesday, July 20, 2021
Scientific Responsible name : marie hervé
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 December 2021
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly

Description of the thesis topic

Scanning tunnelling microscopy (STM) is a versatile tool that allows investigating electronic, magnetic, as well as vibronic excitations of single molecules or atoms on surfaces in the sub-meV range. Excitation spectra can be probed using conventional STM as long as the energy separation between the states is larger than 3.2kbT, i.e., the Fermi-Dirac broadening at finite temperature. To give an example, at a temperature of 300 mK, the STM energy resolution is about 90 µeV. Since a few years a new promising method allows to go much further by exploiting radio-frequency resonances. The recently developed rf-STM, it is liable to address electronic, magnetic and vibronic excitation spectrum down to few neVs resolution at the atomic scale. The possibility to access such a high energy resolution with an STM was demonstrated only recently in the literature and such an experimental setup is currently under construction at INSP.

The objectives of the Phd thesis will be to finalise the construction of the rf-STM and investigate low energy magnetic excitation in paramagnetic and ferromagnetic nanoobjects.

- Sample growth (molecular beam epitaxy)
- Low temperature STM, Spin polarized STM and rf-STM characterisation
- Construction of a rf-STM

- Expertise in magnetism.
- Expertise in physics including solid state physics.
- Expertise in surface preparation technics including molecular beam epitaxy, growth of oxide thin films and ultra-high vacuum setups.
- Technical competencies for assembling, wiring and testing a low temperature STM.

Work Context

The PhD work will take place at the Institut des NanoSciences de Paris

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