August 2023
A study has been published upon the phase diagram of 3D artificial spin-ice. Using Monte-Carlo simulations, our team have identified a number of charge-ordered phases in these systems, including a double-charge and single-charge monopole crystal. Experimental 3DASI systems were fabricated and demagnetised, yielding an out-of-equilibrium state with crystallites of magnetic charge superimposed upon an ice background. The article can be found here
June 2023
Sam Ladak gave invited presentation at “Frontiers in Artificial Spin-ice”, Lenzburg, Switzerland. In addition, Dr Joseph Askey wins poster prize for his work upon sub-100nm nanowires and attempting to realise thermal 3D artificial spin-ice. A big thank you to Laura Heyderman and team for hosting this fantastics workshop.
Later in June, Sam Ladak gave another invited talk at CMQM 2023.
May 2023
The research of Sam Ladak, along with Anjan Barman, Andrii Chumak, Will Branford and Dirk Grundler are featured in article “Those magical magnons”, within the technology magazine Shaastra.
April 2023
This month a study has been published upon spin-wave propagation in magnetic nanowires of crescent shaped cross-section. The study has been led by the group of Prof Maciej Krawczyk (Adam Mickiewicz University) and in collaboration with Prof Anjan Barman (Bose Centre, India). The article can be found here.
December 2022
We are once again pleased to receive a large award from EPSRC to study 3D nanostructured materials in collaboration with academics in Exeter and Southampton.
Dr Sam Ladak, together with Amalio Fernandez-Pacheco (Zaragoza) and Peter Fischer (Berkeley) , publish an editorial upon our special issue upon “The Science and Technology of 3D Magnetic Nanostructures”. The article can be found here.
November 2022
Dr Sam Ladak and Dr Arjen van Den Berg contribute towards a book chapter upon “Complex-Shaped 3D Nanoarchitectures for Magnetism and Superconductivity”, together with other international co-authors. The chapter can be found in the book “Curvilinear Micromagnetism: From Fundamentals to Applications”, published by Springer. An electronic copy can be found here.
July 2022
This month we have two studies published. Firstly, we have identified a new type of domain wall in cylindrical magnetic nanowires. We have named it the asymmetric dual Bloch point domain wall and it has a unique topology combining aspects of two other common walls found in these systems. The publication can be found here.
Secondly, we have harnessed a sacrificial layer with two-photon lithography in order to realise isolated 3D magnetic nanostructures with no background sheet film. This allows optical magnetometry to be harnessed in order to study a variety of magnetic nanowire and 3D artificial spin-ice structures. This work will be published shortly.
February 2022
Dr Sam Ladak has contributed to “The Roadmap on Spin-Wave Computing”, writing a section upon “Magnetic charge transport and spin-wave propagation in 3D nanostructured lattices”, in collaboration with Prof Anjan Barman, Bose National Centre for Basic Sciences, India. This has been published in the IEEE Transactions on Magnetics. The article can be found here.
November 2021
We are excited to announce a special issue of APL Materials upon the subject “Science and Technology of 3D Magnetic Nanostructures”.
This special issue is now open for submissions and is guest edited by Sam Ladak (Cardiff U.K.), Amalio Fernandez-Pacheco (University of Zaragoza, Spain) and Peter Fischer (Lawrence Berkeley Lab, U.S.)
More information can be found here.
October 2021
We are currently recruiting for students wishing to undertake a PhD in 3D artificial spin-ice structures. For informal enquiries or details of the application process, please contact Dr S Ladak.
August 2021
We are delighted to have been awarded funding to pursue a Leverhulme Trust research project upon ordering in complex 3D magnetic nanostructures.
June 2021
Our latest joint work with Prof Anjan Barman presents the first observation of coherent spin waves in a 3D artificial spin ice system. The work has been published in Nano Letters. The article can be found here
May 2021
Our latest work upon 3D artificial spin-ice (3DASI) has been published in Nature Communications. The study which was carried out in collaboration with theorist Dr Michael Saccone, Los Alamos National Lab, shows that the broken symmetry of a 3DASI surface changes magnetic charge nucleation and propagation. The article can be found here
February 2021
Dr Sam Ladak contributed to “The 2021 Magnonics Roadmap”, writing a section upon “Novel Fabrication Techniques for Magnonics”, in collaboration with Adekunle Olusola Adeyeye, Durham University. This has been published in Journal of Physics: Condensed Matter Physics. The article can be found here
March 2020
Paper published: “Use of Two-photon Lithography with a Negative Resist and Processing to Realise Cylindrical Magnetic Nanowires”, in Nanomaterials. The article can be found here
February 2020
Review published: “Harnessing Multi-Photon Absorption to Produce Three-Dimensional Magnetic Structures at the Nanoscale”, in Materials Journal. The article can be found here
November 2019
Sam Ladak gives invited talk at MMM, Las Vegas.
October 2019
We welcome Edward Harding as a new PhD student.
January 2019
Very excited to announce that our recent work upon 3D magnetic frustrated lattices has been published in the new Nature Publishing Group journal, Communications Physics. The article can be found here.
Group members present at Intermag 2019, Washington DC
July 2018
Group photograph
April 2018
We are pleased to announce that our work in collaboration with Prof Anjan Barman upon time-resolved magnetisation dynamics within 3D tetrapod structures has now been accepted by Nanoscale.
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We are pleased to announce that our recent publication on 3D nanostructured micro-lenses has been accepted in Optics Express. This publication was written in collaboration with Prof Peter Smowton. The preprint can be found here.
Our group presents latest work at Magnetism 2018.
January 2018
We have fully funded PhD studentships available. Please see this link for more details: PhD studentships
November 2017
We are absolutely thrilled to have received a large award from the Engineering and Physics Research Council in order to improve the resolution of two-photon lithography.
May 2017
Our work upon two-photon lithography and 3D magnetic nanostructures has been accepted by Nano Research and a copy of the publication can be found here
April 2017
Group member Matthew Hunt presents his work upon 3D magnetic nanostructures at Intermag 2017, Dublin.
October 2016
We welcome Andrew May to our research group. Andrew will be pursuing a PhD upon 3D magnetic nanowires.
July 2016
We welcome Lucas Chapuis to the group, who will be working with us over the summer.
June 2016
Group members have come to IBM Research, Zurich to measure our 3D magnetic nanostructures. We thank Rolf Allenspach and group for his hospitality.
May 2016
Fully funded PhD position available upon 3D magnetic nanostructures within our laboratory, starting in October 2016. If interested then please send me an email (LadakS at cardiff.ac.uk). Studentship advert can be found here.
April 2016
Congratulations to group members Ifan Williams and Matthew Hunt on winning the best poster prize at Magnetism 2016. The work demonstrates how we are able to fabricate 3D magnetic nanostructures with feature sizes of approximately 500nm. We expect further work to reduce this to approximately 200nm.
January 2016
Very pleased to announce that our new two-photon lithography system has been installed within our lab and is now operational. The system is capable of fabricating 3D nanostructures down to a feature size of 200nm. The system has been installed within a dedicated class 1000 cleanroom situated within our laboratory. We will be using the system intensively in order to manufacture 3D magnetic nanowires and structures.
December 2015
Nanoscribe are here to install the new two-photon lithography system. Acceptance test has been completed and we have written our first 3D nanostructures shown above. The picture shows a 3D woodpile structure with feature size <200nm.