Events

We run a regular programme of seminars for staff and students.

Speaker Seminar Details

Paul Keatley (Exeter)

(Seminar) Time-resolved scanning Kerr microscopy of magnetization dynamics at the nanoscale

Time-resolved scanning Kerr microscopy (TRSKM) is a powerful tool for the investigation of the magnetization dynamics at sub-micrometer length scales with picosecond temporal resolution. A variety of measurement configurations allows a range of dynamic magnetic phenomena to be explored including sub-gigahertz gyrotropic oscillations of magnetic vortices, picosecond magnetic re-orientation in hard disk writers, domain wall dynamics and excitations in nanowires, non-uniform confinement of spin waves in nanomagnets, and low-temperature ferromagnetic resonance of thin films. Recently TRSKM has been used to understand the coupled response of vortices, domain walls, and spin-waves that govern the behaviour of magnonic metamaterials for magnetic logic and signal processing applications. At the same time, the influence of a spin-torque on these magnetic excitations is of fundamental interest for spintronic devices for non-volatile memory elements and microwave oscillators. In this presentation the results of TRSKM on individual nanomagnets are presented. The influence of the precise shape, material parameters, and spin-torque on the confined spin waves modes of individual nanomagnets will be discussed in addition to the effect of nearest neighbour static and dynamic dipole interactions in pairs and arrays of nanomagnets. Finally, a summary of recent developments including the detection of magnetisation dynamics in spin-torque oscillators and the realisation of near-field TRSKM will be presented.

13 December 2017 (15:00)
Queens Buildings N/3.28

Dr. Jan Forbrich (University of Hertfordshire)

(Colloquium) TBD

TBD

17 January 2018 (15:00)
Queens Buildings N/3.28

Dr. Claudia Cicone (Brera Observatory, Milan)

(Astronomy Seminar) TBD

24 January 2018 (14:00)
Queens Buildings N/3.28

Dr. Alvaro Hacar (Universiteit Leiden)

(Astronomy Seminar) TBD

31 January 2018 (14:00)
Queens Buildings N/3.28

Dr. Camilla Danielski (Observatoire de Paris)

(Astronomy Seminar) TBD

7 February 2018 (14:00)
Queens Buildings N/3.28