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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.

Objectives:
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.

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

Competences:
- 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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