Picosecond Dynamics of Magnetic Exchange Springs

Lead Research Organisation: University of Oxford
Department Name: Oxford Physics

Abstract

Abstracts are not currently available in GtR for all funded research. This is normally because the abstract was not required at the time of proposal submission, but may be because it included sensitive information such as personal details.

Publications

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Awana G (2022) Critical analysis of proximity-induced magnetism in MnTe / Bi 2 Te 3 heterostructures in Physical Review Materials

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Bowden G (2019) Expanding the Lorentz concept in magnetism in New Journal of Physics

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Da Browski M (2021) Transition Metal Synthetic Ferrimagnets: Tunable Media for All-Optical Switching Driven by Nanoscale Spin Current. in Nano letters

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Da Browski M (2020) Optically and Microwave-Induced Magnetization Precession in [Co/Pt]/NiFe Exchange Springs. in ACS applied materials & interfaces

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Dabrowski M (2021) Canted standing spin-wave modes of permalloy thin films observed by ferromagnetic resonance in New Journal of Physics

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Dabrowski M (2020) Coherent Transfer of Spin Angular Momentum by Evanescent Spin Waves within Antiferromagnetic NiO in Physical Review Letters

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Duffy L (2019) Magnetic profile of proximity-coupled ( Dy , Bi ) 2 Te 3 / ( Cr , Sb ) 2 Te 3 topological insulator heterostructures in Physical Review B

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Duffy L (2018) Imposing long-range ferromagnetic order in rare-earth-doped magnetic topological-insulator heterostructures in Physical Review Materials

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Feng J (2018) Electronic Structure and Enhanced Charge-Density Wave Order of Monolayer VSe2. in Nano letters

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Frisk A (2023) Controlling In-Plane Magnetic Anisotropy of Co Films on MgO Substrates using Glancing Angle Deposition in physica status solidi (a)

 
Description By the end of the second reporting period (9 + 12 months), the following milestones were reached:
- DyFe2/YFe2 SLs
- DyFe2/YFe2 trilayers
- Trilayers with ErF2 substitution

The following milestones were reached by the end of the third reporting period:
- FePt/NiFe/FePt trilayers
- Mn spy layer study (inserted into NiFe springs)
- CoPt/NiFe/CoPt trilayers

By the end of the fourth reporting period, a steady (COVID permitting) supply of the following samples has been produced:
- FePt/NiFe/FePt trilayers
- CoPt/NiFe/CoPt trilayers

Since the project had finished, samples relevant to the originally proposed work are still being produced, measured and analyzed. One publication on the GLAD deposition technique has been accepted in February 2022, and two more, one establishing so-called spy layers for the monitoring of magnetization dynamics as a function of depth, and one on the successful demonstration of an exchange spring at remanence in CoPt/NiFe/Co trilayers are being prepared for submission in the first quarter of 2023.
Exploitation Route The thin film systems produced during the tenure of the grant are still used by the other members of the research team in Exeter and at the Diamond Light Source, who are part of the larger project cluster on exchange spring materials. Owing COVID (see separate comments), we have effectively lost 2 years, however, the foundation for the exploitation of the method has been laid and we are hopeful that our capabilities will seed new collaborations and projects in the near future.
Sectors Digital/Communication/Information Technologies (including Software),Electronics
 
Description Spin waves to the rescue: Development of a spintronic reservoir computing platform
Amount £451,563 (GBP)
Funding ID EP/V028049/1 
Organisation Engineering and Physical Sciences Research Council (EPSRC) 
Sector Public
Country United Kingdom
Start 04/2021 
End 09/2023
 
Title Design of advanced sputtering system 
Description Over the past 10 months, we designed, optimized and manufactured a novel sputter deposition cluster with advanced capabilities. This tool is now under construction and will be used for the research project. After it has been fully qualified and optimized, it will be a open for other research collaborations as well. 
Type Of Material Improvements to research infrastructure 
Year Produced 2018 
Provided To Others? No  
Impact The magnetization dynamics of magnetic exchange spring (ES) structures present a great opportunity to investigate the local exchange interaction (EI) in artificially structured materials, and determine how the EI responds to optical excitation. An ES may also have bistable states that can be used to store information. The exchange energy stored within an ES can reduce or even remove the need for an applied magnetic field in heat assisted magnetic recording (HAMR) - a cutting-edge technology for further increasing the storage density of hard drives. The translation of our knowledge gained in this object to commercially feasible applications requires use of transition-metal-based materials prepared by sputtering. This UHV sputtering system will deposit textured structures with both in and out of plane anisotropy. 
 
Title Design of advanced sputtering system - assembly 
Description Over the past 12 months, we assembled a novel sputter deposition cluster with advanced capabilities. This tool is now finished and first samples have been delivered to the collaborators in the research project. The sputtered is now open for other research collaborations as well, and we have recently approached industry to develop joint projects. 
Type Of Material Improvements to research infrastructure 
Year Produced 2019 
Provided To Others? No  
Impact The magnetization dynamics of magnetic exchange spring (ES) structures present a great opportunity to investigate the local exchange interaction (EI) in artificially structured materials, and determine how the EI responds to optical excitation. An ES may also have bistable states that can be used to store information. The exchange energy stored within an ES can reduce or even remove the need for an applied magnetic field in heat assisted magnetic recording (HAMR) - a cutting-edge technology for further increasing the storage density of hard drives. The translation of our knowledge gained in this object to commercially feasible applications requires use of transition-metal-based materials prepared by sputtering. This UHV sputtering system is now used to deposit textured structures with both in and out of plane anisotropy. 
 
Title GLAD sputter cluster 
Description Further improvements of the sputter cluster have been made over the past year, increasing the up-time and reliability. The tool is being used for the engineering of the magnetic anisotropy of thin films, and is unique in its capabilities in the UK. 
Type Of Material Improvements to research infrastructure 
Year Produced 2019 
Provided To Others? Yes  
Impact The first peer-reviewed paper reporting on the specific deposition method and capabilities of the deposition system has been accepted in February 2022, and we hope that this will enable the establishment of new links with other research groups in need of engineering magnetic thin films. Two more publications are underway, reporting on the application of the deposition method (and the deposition tool) for specific magnetic applications. 
 
Title Optimization of an advanced sputtering system 
Description Over the past 12 months, we have used the novel sputter deposition cluster to produce samples that have been successfully used in 3 beamtimes so far. We are in the process to further expand its capabilities by adding an electron diffraction system to the main chamber. This is a challenging task due to the unpredictably varying magnetic stray field produced by the deposition sources. The sputterer is now open for other research collaborations. We are still in the process of starting joints projects with industry. 
Type Of Material Improvements to research infrastructure 
Year Produced 2019 
Provided To Others? Yes  
Impact The magnetization dynamics of magnetic exchange spring (ES) structures present a great opportunity to investigate the local exchange interaction (EI) in artificially structured materials, and determine how the EI responds to optical excitation. An ES may also have bistable states that can be used to store information. The exchange energy stored within an ES can reduce or even remove the need for an applied magnetic field in heat assisted magnetic recording (HAMR) - a cutting-edge technology for further increasing the storage density of hard drives. The translation of our knowledge gained in this object to commercially feasible applications requires use of transition-metal-based materials prepared by sputtering. This UHV sputtering system is now used to deposit textured structures with both in and out of plane anisotropy. 
 
Description WOMAD (World of Music, Arts and Dance) 
Form Of Engagement Activity Participation in an activity, workshop or similar
Part Of Official Scheme? No
Geographic Reach National
Primary Audience Public/other audiences
Results and Impact My contribution to the activity was the building of 3D models illustrating magnetic exchange springs to make them a tangible experience for the visitors of the booth. The presentations were given by Dr Andreas Frisk (part of the exchange spring project and based at Diamond).
Year(s) Of Engagement Activity 2019