David Newman and Kostas Chatzimpaloglou present at the Institute of Physics Current Research in Magnetism 2020: High Frequency Spintronics

Last month, 2nd year PGRs David Newman  and Kostas Chatzimpaloglou both gave contributed talks for the Institute of Physics Current Research in Magnetism 2020: High Frequency Spintronics, which was held virtually.

David Newman

David’s presentation was on “Spin current propagation through an epitaxial antiferromagnetic NiO layer”. In this talk, he demonstrated the use of the inverse spin Hall effect (ISHE) and X-ray Ferromagnetic Resonance (XFMR) measurements to observe a DC and AC spin current respectively propagating through an antiferromagnetic layer in a multilayer sample. This is intended to inform future studies on spin current propagation which is a vital step in the development of spintronic devices.

David says of his talk:

I found it a great experience to present my work as part of a programme filled with the big names in the research field and make more contacts within the community.

 

Kostas’ talk was titled “Time resolved magneto-optical study of spin-orbit torques (SOTs) in ellipsoidal CoFeB/Pt

Kostas Chatzimpalouglou

elements” and focused on results gathered from the development of a magneto-optical Spin Transfer Torque Ferromagnetic Resonance (STT-FMR) technique to explore the magnetization dynamics that arise in these devices in response to DC current excitation.

By comparing with a macrospin model simulation with experimental data, this proves that when DC current is large enough, the DC SOT is observed to act on the magnetization. However, the strong DC Oersted field produces similar features in the resonance to the effect of SOT. Thus, it is required careful fitting to determine the value of SOT.

David Newman chairs session at UK Magnetics Society Student Conference

David Newman

Second year PGR David Newman reently chaired a session at UK Magnetics Society Student Conference where he chaired a session and presented a talk entitled ‘Electrical detection of a DC spin current through an epitaxial antiferromagnetic NiO layer’.

The event was virtually hosted by the UK Magnetics Society to provide a platform for PhD student conference talks that had been cancelled due to the COVID-19 pandemic and also included several talks from academics and industrialists about their experiences in magnetism.

David reports on his experience:

I was responsible for chairing the session on “Nanoscale Magnetics” which featured a broad range of topics from spintronics to materials modelling. Running the session gave me valuable experience in event organisation/management whilst also getting the opportunity to network with other PhD speakers from across the country.

The term “spin currents” refer to the flow of intrinsic spin angular momentum without an accompanying charge transfer (as in a traditional electrical current). In my talk (originally planned for Intermag2020), I showed how the inverse spin Hall effect can be used to transfer a spin current into an electrical current for convenient measurement and applied this to a complex multilayer stack with an antiferromagnetic NiO layer. This work is of particular relevance to magnetic data storage which has turned to spintronic concepts and antiferromagnets for denser magnetic data storage which is more energy-efficient and operates at higher speed.

The conference offers a platform to those students working in magnetics related subjects to talk about their research and work.

Materials Research Exchange 2020 – a poster prize winner and new connections for Exeter

The Exeter metamaterial delegation at the MRE2020 in London (left to right): Joe Shields, Prof A Hibbins, Conor Murphy, Dr Lauren Barr, Dr A Roeding, Elizabeth Martin, Pavel Petrov, and Katie Lewis.

Exeter’s Metamaterials delegation returned from the biennial Materials Research Exchange 2020 event with a poster prize, a wide range of contacts made, and new insights in the UK materials landscape across industry, academia, and UKRI.

2 eventful days in London with over 80 speakers, 1500 delegates, and 70 exhibitors attending enabled interesting conversations on how Exeter’s expertise could feed into projects such as replaceable car batteries; security elements for bank notes; and utilisation of AI for metamaterial identification, modelling, and characterisation. Both Innovate UK’s deputy chair and Chief Business Officer, Simon Edmunds, and EPSRC’s new Head of Advanced Materials, Claire Spooner, visited our stand for conversations on metamaterials and the UKRI landscape.

Prof Alastair Hibbins, Director of the Centre for Metamaterial Research and Innovation and its Doctoral Training Centre XM², engaged the audience in a dedicated metamaterials session with a talk on “Metamaterials v2.0 – Beyond Cloaking”, followed by presentations on acoustic and mechanical/elastic/seismic metamaterials from colleagues at Imperial College London, University of Sussex, and Southampton.

Finally, our very own Conor Murphy, PhD student in our Centre for Doctoral Training (XM²) won 1st prize for his poster explaining how GraphExeter outperforms Indium tin oxide (ITO) as flexible transparent electrode in OLED.

Emanuele Gemo and Joaquin Faneca present at Photonic West conference

Fourth year students Emanuele Gemo and Joaquin Faneca recently attended Photonic West, the biggest conference in the world of photonics, which was held in San Francisco, Moscone centre. In this conference, Emanuele was presenting his work based on “Sub-wavelength plasmonic enhance phase change memory”. Joaquin Faneca was giving an oral presentation relating to his work on “Reconfigurable integrated circuits based on functional materials” and a poster called “On-chip sub-wavelength Bragg grating design based on GSST”.

Emanuele Gemo presenting
Joaquin Faneca presenting

CDT students co-organise Exeter-Bath Knowledge Transfer conference

During October 2019, some of our CDT students hosted a one-day student conference at the University of Exeter. This was co-organised with some PhD students from the Centre for Photonics and Photonic Materials (CPPM) from University of Bath- the “Exeter-Bath Knowledge Transfer”. The aim of this event was to bring together researchers from both institutions and share the research that is being carried out in optics and photonics. In total, 23 students attended this event (9 from Bath, 14 from Exeter) and had the opportunity to present their work and learn about each other’s research projects. This event was useful for interchanging ideas and to begin establishing a network between the CPPM and CDT.

The program of the conference consisted of several oral presentations, some white board explanations and a poster session. At the end of the conference, our students gave a tour around some of the laboratories and the nanofabrication clean room facilities. Finally, a social was held at the Imperial to end a successful day.

The Exeter-Bath Knowledge Transfer event was organised thanks to seed funding that Iago Rodriguez Diez, Harry Penketh, Ben Hogan and students from the CPPM obtained from the collaborative discussion-led incubator workshop “Light@Bath”. This workshop took place in May at University of Bath for the International Day of Light and was supported by the EPSRC-funded project Reimagining Recruitment. The purpose of the event was to bring together researchers who work in photonics in order to exchange ideas, propose problems that are yet to be solved and generate collaborations. The outcome of this workshop was the organization of the one-day conference “Exeter-Bath Knowledge Transfer”.

Iago, one of our CDT students who co-ordinated the event, reported:

“This event was a very nice opportunity for getting to know what another research centre working in photonics does with light. As the main Exeter co-organizer of the event, this was a very good practice for me to challenge my organization and time management skills in terms of personal development. Thanks to everyone involved in the event!”

Rosamund Herapath presents at TERANET UK-THz Symposium

On 4th and 5th December 2019, fourth year PGR Rosamund HerapathDr. Lauren Barr (alumna of the CDT) and Prof. Euan Hendry went to National Physical Laboratory (NPL) for the ‘TERANET UK-THz Symposium’.

The event included 23 speakers from around the UK to discuss recent advances made in the field of mm-wave and THz research, alongside updates from ongoing collaborations and larger scale THz projects. There was also a poster session and evening meal. Topics included: THz imaging, photomodulators, THz metamaterials and others.

Rosamund at Teranet Dec 2019
Dr. Lauren Barr at Teranet Dec 2019

Rosamund presented her work ‘Terahertz Emission from a Cavity- enhanced Spintronic Trilayer’.
Lauren presented ‘Using geometry to improve modulation for single-pixel THz imaging’.
Euan presented a keynote talk ‘Computational mm-wave and THz imaging’.

Teranet UK is an EPSRC network for THz science and technology research in the UK, and encourages collaborations and communication across UK THz groups at Universities and other facilities to take advantage of the high number of THz groups in the UK.

Prof. Euan Hendry at Teranet Dec 2019

Oliver Latcham presents his work at Magnetism and Magnetic Materials (MMM: 2019) Conference

Oliver presents his poster, ‘Hybrid Magneto-Acoustic Metamaterials’

Second year PGR Oliver Latcham discusses presenting at MMM 2019 and attending the SAM 2019: Symposium on Acoustic Metamaterials:

From Oct. 9th-11th I attended a symposia “SAM 2019: Symposium on Acoustic Metamaterials” in Naples, Italy and Nov. 4th-8th a conference “Magnetism and Magnetic Materials (MMM: 2019)” in Las Vegas, Nevada, presenting my work on Hybrid Magneto-Acoustic Metamaterials in oral (SAM) and poster (MMM) formats. The work I presented focused on coupling between Magnon and Phonons in a 1D array of periodically arranged magnetostrictive and non-magnetic media.

Both the symposia and conference were invaluable experiences, allowing me primarily to discuss my own work, and the work of others in the same or similar fields. They were also brilliantly organised, and had packed schedules with plenty of social events. It was a great experience visiting these brilliant venues and talking again to friends and colleagues I had met at other events as well as meeting new ones.

 

Jess Brown at Acoustofluidics Forum

Jess presents her research

On 16th and 17th October, third year PGR Jess Brown attended Acoustofluidics Forum. She reports on her experience of the event:

 

This 2-day meeting of the Acoustofluidics Special Interest Group in the UK Fluidic Network took place at Cardiff University, hosted by Dr Chris Yang and his research group (MUSL) – this is the 9th SIG meeting since 2017, and they have been held all over the UK and further afield.
I attended with Caroline Pouya (a post-doc in my research group), and we both gave talks about our current research, discussing how it’s related to Acoustofluidics. This was the first presentation I’ve given outside the CDT, so it was a big confidence boost for me to get some external validation of my work! The other attendees had interesting questions for me to consider, and I also found some potential collaborations.
Since my research is only tenuously associated with acoustofluidics, I found learning about something slightly different a welcome and stimulating change of scene – talks about engineering and medical applications particularly stood out for me, which explored how sound can be used to sense damage in aircraft components and monitor heart function, or filter bacteria from milk and manipulate cancer cells for disease diagnosis. I also appreciated the networking sessions, meeting other PhD students and big names in the field, and sharing ideas and experiences.
Overall it was a very enjoyable event, and I’m keen to attend another soon! Back to my own research in the meantime…

Julia de Pineda Gutierrez wins best student paper at IEE Radio and Antenna days of the Indian Ocean Conference

Fourth year PGR Julia de Pineda Gutierrez discusses the two conferences she recently attended and their successful outcomes:

Last month, I attended two conferences, where I had the chance to present my latest research. Between the 16th and the 21st of September I took part in the 13th International congress on Artificial Materials for novel wave phenomena (also known as Metamaterials) in Rome. I was invited to present my work in a special session organized by the Physical Review Journals. After the session there was also an opportunity to meet the Physical Review editors. The session was a showcase for the work that was published in the different Physical Review Journals the year before. I was invited to present my paper on microwave edge modes that was published in Physical Review B, titled ‘Microwave edge modes on a metasurface with glide symmetry’.

The conference was a great opportunity to make new contacts and to learn about the latest work in the field of metamaterials.

The following week, I flew to Reunion Island, a French territory in the Indian Ocean, to attend the IEEE Radio and Antenna days of the Indian Ocean conference. I also gave an oral presentation, in this case titled ‘Metasurfaces for high index effective media’.

With this, I won the best student paper competition, which included a certificate and a 300€ cash prize.

Julia’s other publications include Metasurface bilayer for slow microwave surface waves’ and ‘Hexagonal symmetry metasurfaces for broadband antenna application’.

Julia presents her latest research