Loading Events

« All Events

  • This event has passed.

Claire Donnelly: Three-dimensional nanomagnetism: from textures in the bulk to 3D magnetic nanostructures

January 13 @ 10:00 am - 11:00 am

https://ubc.zoom.us/j/68470173961?pwd=RTZEak9Pd01WajVOZHN5SW5YZHcyQT09
Meeting ID: 684 7017 3961
Passcode: 113399

 


Speaker:

Claire Donnelly, Max Planck Institute for Chemical Physics of Solids

 

Abstract:

Three dimensional magnetic systems promise significant opportunities for applications, for example providing higher density devices [1] and new functionalities associated with complex topology and greater degrees of freedom [2,3].

 

With the recent development of three-dimensional imaging techniques, it is now possible to map internal three-dimensional magnetic structures, and their response to external excitations. In this way we have observed three-dimensional vortex structures, as well as Bloch point singularities [4,5] and, more recently, nanoscale magnetic vortex rings [6,7].

 

In addition to the static magnetic structure, the dynamic response of the 3D magnetic configuration to excitations is key to our understanding of both fundamental physics, and applications. With our recent development of X-ray magnetic laminography [5], it is now possible to determine the magnetisation dynamics of a three-dimensional magnetic system [5].

 

As well as observing magnetic textures within the “bulk”, recent advances in nanofabrication make possible the fabrication of complex 3D magnetic nanostructures [8]. In this way we have realised magnetic double helices [9], which host highly coupled domain wall pairs that in turn lead to textures in the magnetic induction [9]. These offer not only a potential route to domain wall processing, but also for the patterning of nanotextures in the magnetic field.

 

These new experimental capabilities for 3D magnetic systems open the door to complex three-dimensional magnetic structures, and their dynamic behaviour.

 

References:

[1] Parkin et al., Science 320, 190 (2008)

[2] Fernández-Pacheco et al., Nat. Comm. 8, 15756 (2017)

[3] Donnelly and Scagnoli, J. Phys. D: Cond. Matt. 32, 213001 (2020).

[4] Donnelly et al., Nature 547, 328 (2017).

[5] Donnelly et al., Nature Nanotechnology 15, 356 (2020).

[6] Cooper, PRL. 82, 1554 (1999).

[7] Donnelly et al., Nat. Phys. 17, 316 (2020)

[8] Skoric et al., Nano Lett. 20, 184 (2020).

[9] Donnelly et al., Nature Nanotechnology (2021) https://doi.org/10.1038/s41565-021-01027-7 .

 

Biography:

Following her MPhys at the University of Oxford, Claire went to Switzerland to carry out her PhD studies at the Paul Scherrer Institute and ETH Zurich. She was awarded her PhD in 2017 for her work on 3D systems, which was recognised by a number of prizes including the APS Richard Greene Dissertation Award, the Werner Meyer-Ilse Memorial Award, the ETH Medal, and the SPS Award for Computational Physics. After a postdoc at the ETH Zurich, she moved to the University of Cambridge and the Cavendish Laboratory as a Leverhulme Early Career Research Fellow, where she was awarded the L’Oreal For Women In Science Fellowship, and the European Magnetism Association Young Scientist Award. Since September 2021 she is a Lise Meitner Group Leader of Spin3D at the Max Planck Institute for Chemical Physics of Solids in Dresden, Germany.

Details

Date:
January 13
Time:
10:00 am - 11:00 am