Johansson Research Group

We use femtosecond laser pulses to study and control magnetic materials, which are the basic components in data storage devices.  Magnetic materials have revolutionised the advancement of consumer electronics during the twentieth century and have completely changed how we can access and make use of information. A continued development of new magnetic materials and new ways of controlling them will contribute to the development of future information storage devices. This is important because improving how we handle and process the large amount of data generated in our society will affect a wide range of areas such as health care, government, logistics, and will reduce global energy consumption.

Vibrating molecules

Research Keywords

  • Molecular magnetism
  • Femtosecond lasers
  • Spectroscopy and dynamics
  • Magnetic circular dichroism (MCD)
  • Thin films
  • Nanomaterials
  • Spectroelectrochemistry
  • Chemical physics

Upcoming Events

2021 GRC on Photochemistry

The 2021 Gordon Research Conference on Photochemistry will take place in Lewiston, Maine, USA on 1 - 6 August 2021.

UMC 2021

The 5th Ultrafast Magnetism Conference is scheduled to take place in Nancy, France on 20 - 24 September 2021.

From optical to THz control of materials Faraday Discussion

Faraday discussion on ultrafast control of the physical properties of materials by light excitation and/or THz excitation. Given the rapid development of experimental techniques, including XFEL science, THz science and various pump–probe techniques, and developments in the theory of ultrafast, out-of-equilibrium and multiscale processes driven by light or THz excitation, this meeting will provide a roadmap of where the field is and what the challenges are over the next 5–10 years and beyond.

The meeting will take place in London on 23 - 25 May 2022.



A femtosecond magneto-optical spectrometer

Jake’s paper on a femtosecond magneto-optical spectrometer is now available on Arxiv. In the paper, Jake describes how a transient absorption spectrometer and an electromagnet can be used to obtain time-resolved magnetic circular dichroism spectra with 0.4 mdeg sensitivity. Well done, Jake!

Paper accepted in Thin Solid Films

Hal's work on mitigating scatter in Prussian Blue films has been accepted in Thin Solid Films. The paper discusses the use of optically transparent adhesives in improving transmittance in thin film PBAs.

Left-to-right: Olof, Jake, Tom, Hal, Kyle, Ryan, Iona

Group Social June 1st 2021

The group had our first in-person social of the year! Long overdue!

Review article published in PCCP

Our review on the ultrafast photoinduced dynamics in Prussian blue analogues (PBAs) has been published in Physical Chemistry Chemical Physics. We discuss the main processes observed in PBAs after photoexcitation on both femtosecond and nanosecond timescales and techniques used.

Victory for Quizical Chemistry!

Kyle, Jake and Hal joined forces with Elliott of the Campbell group to partake in Chemunity's Battle of the Centuries Quiz, taking first place!