Postdoctoral Researcher (M/F) - Terahertz spectroscopy and spin currents in magnetic oxides
New
- Researcher in FTC
- 18 months
- Doctorate
This offer is available in English version
This offer is open to people with a document recognizing their status as a disabled worker.
Offer at a glance
The Unit
Institut d'Electronique de Microélectronique et de Nanotechnologie
Contract Type
Researcher in FTC
Working hHours
Full Time
Workplace
59652 VILLENEUVE D ASCQ
Contract Duration
18 months
Date of Hire
16/10/2026
Remuneration
between 3071€ and 3501€ gross monthly depending on experience
Apply Application Deadline : 10 August 2026 23:59
Job Description
Missions
The successful candidate will investigate the ultrafast magnetic dynamics of rare-earth orthoferrite and hexaferrite thin films developed within MoxSpin, a collaborative project of the French PEPR SPIN programme. These insulating oxides exhibit magnetic resonances in the sub-THz/THz range and are promising platforms for active manipulation of terahertz waves and spin-based THz generation.
The research combines two complementary directions: (i) identifying magnon and electromagnon modes excited by THz radiation and determining how their response can be controlled by magnetic field, temperature, polarization or a spin-reorientation transition; and (ii) investigating photocurrents and spin currents generated by femtosecond laser excitation and their conversion into THz emission in magnetic-oxide/heavy-metal heterostructures.
Activity
• Perform polarization-resolved THz time-domain spectroscopy on orthoferrite and hexaferrite films as a function of temperature, magnetic field and crystal orientation.
• Identify far-infrared-active magnetic modes and determine their resonance frequencies, linewidths, selection rules and damping mechanisms.
• Investigate how spin-reorientation transitions modify THz transmission, absorption, birefringence and gyrotropy, and explore their optical control using optical-pump/THz-probe experiments.
• Carry out femtosecond-pump THz-emission measurements on bare oxide films and on heterostructures incorporating heavy metals such as Pt or Ta.
• Study the influence of pump photon energy, fluence, polarization and helicity in order to distinguish transient photocurrents, magnon contributions, ultrafast spin-Seebeck transport and inverse-spin-Hall spin-to-charge conversion.
• Develop acquisition and analysis scripts, compare the measurements with electromagnetic and spin-dynamics models, and contribute to publications, conferences and consortium meetings.
Your Profil
Skills
PhD in experimental physics, photonics, ultrafast optics, magnetism, spintronics or a related field. Hands-on experience in at least one of the following areas is expected: THz time-domain spectroscopy, THz-emission spectroscopy, femtosecond pump-probe measurements, time-resolved magneto-optics or ultrafast magnetization dynamics. The candidate should be able to align and automate a complex experimental setup and should have good scientific-programming skills in Python, MATLAB or an equivalent environment. Knowledge of antiferromagnetism, magnons, magnetic resonance or spin caloritronics would be an advantage. Very good scientific English is required; French is not mandatory.
Your Work Environment
The position is based in the THz Photonics group at IEMN (UMR 8520), on the Cité Scientifique campus in Villeneuve-d'Ascq, under the scientific supervision of Mathias Vanwolleghem. The researcher will have access to IEMN's THz time-domain and THz-emission spectroscopy facilities and will work closely with MoxSpin partners specialising in thin-film growth, structural and magnetic characterization and ultrafast magneto-optics. Short research visits to partner laboratories and travel to scientific conferences are expected.
Constraints and risks
The work is mainly experimental and involves class-4 femtosecond lasers, THz sources and detectors, cryostats and magnetic fields. The required safety training and authorizations will be provided when the candidate joins the laboratory.
Compensation and benefits
Compensation
between 3071€ and 3501€ gross monthly depending on experience
Annual leave and RTT
44 jours
Remote Working practice and compensation
Pratique et indemnisation du TT
Transport
Prise en charge à 75% du coût et forfait mobilité durable jusqu’à 300€
About the offer
| Offer reference | UMR8520-MATVAN-003 |
|---|---|
| CN Section(s) / Research Area | Micro and nanotechnologies, micro and nanosystems, photonics, electronics, electromagnetism, electrical energy |
About the CNRS
The CNRS is a major player in fundamental research on a global scale. The CNRS is the only French organization active in all scientific fields. Its unique position as a multi-specialist allows it to bring together different disciplines to address the most important challenges of the contemporary world, in connection with the actors of change.
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