Dr Sam Ladak
Senior Lecturer
Condensed Matter and Photonics Group
School of Physics and Astronomy
- ladaks@cardiff.ac.uk
- +44 (0)29 2087 0157
- WX/0.06, Queen's Buildings - West Building Extension, 5 The Parade, Newport Road, Cardiff, CF24 3AA
- Available for postgraduate supervision
Overview
In 2012, I was awarded a personal chancellors (SBP) fellowship within the School of Physics and Astronomy with the aim of establishing a research group within the emerging field of 3D nanomagnetism. Prior to this I was a research fellow at Imperial College where I researched artificial spin-ice materials.
Today, the focus of my work is upon 3D magnetic nanostructure fabrication and characterisation using non-linear optical techniques.
Over the past several years I have secured > £1.2M of external (EPSRC) funding as well as small grants from the Royal Society, Welsh Crucible and Cardiff.
I routinely work with other academics from other leading universities (Exeter, Bristol, Southampton) as well as large international research labs (eg. IBM Zurich).
More details of my laboratory and research can be found at my website below:
Ladak Lab
My citation information can be found here
Biography
I completed my PhD from the University of Exeter in 2006. The project involved the fabrication and characterisation of magnetic tunnel junctions. After this I carried out a year in industry at Seagate technology, designing and prototyping magnetic read-heads.
In 2007 I decided to go back to academia and took up postdoctoral positions at the University of York and then Imperial College where I remained for four years.
Throughout my academic career my research has centred on magnetic materials but more recently has focussed on 3D nano-magnetic systems. I was awarded a chancellors fellowship and was employed as a permanent lecturer in physics at Cardiff University in November 2012. In 2018 I was promoted to senior lecturer.
Honours and awards
I am a member of the Editorial Board for the Nature family journal Scientific Reports.
Professional memberships
Institute of Physics : Fellow
Publications
2021
- Sahoo, S.et al. 2021. Observation of coherent spin waves in a three-dimensional artificial spin ice structure. Nano Letters 21(11), pp. 4629-4635. (10.1021/acs.nanolett.1c00650)
- May, A.et al. 2021. Magnetic charge propagation upon a 3D artificial spin-ice. Nature Communications 12, article number: 3217. (10.1038/s41467-021-23480-7)
- Barman, A.et al. 2021. The 2021 Magnonics Roadmap. Journal of Physics: Condensed Matter (10.1088/1361-648X/abec1a)
2020
- Askey, J.et al. 2020. Use of two-photon lithography with a negative resist and processing to realise cylindrical magnetic nanowires. Nanomaterials 10(3), article number: 429. (10.3390/nano10030429)
- Hunt, M.et al. 2020. Harnessing multi-photon absorption to produce three-dimensional magnetic structures at the nanoscale. Materials 13(3), article number: 761. (10.3390/ma13030761)
2019
- May, A.et al. 2019. Realisation of a frustrated 3D magnetic nanowire lattice. Communications Physics 2, article number: 13. (10.1038/s42005-018-0104-6)
2018
- Sahoo, S.et al. 2018. Ultrafast magnetization dynamics in a nanoscale three- dimensional cobalt tetrapod structure. Nanoscale 10(21), pp. 9981-9986. (10.1039/C7NR07843A)
- Thomas, R.et al. 2018. In-situ fabricated 3D micro-lenses for photonic integrated circuits. Optics Express 26(10), pp. 13436-13442. (10.1364/OE.26.013436)
- Williams, G.et al. 2018. Two-photon lithography for 3D magnetic nanostructure fabrication. Nano Research 11(2), pp. 845-854. (10.1007/s12274-017-1694-0)
2017
- Putman, N. F.et al. 2017. Response to Durif et al.. Current Biology 27(18), pp. R1000-R1001. (10.1016/j.cub.2017.08.046)
- Naisbett-Jones, L. C.et al. 2017. A magnetic map leads juvenile European eels to the Gulf Stream. Current Biology 27(8), pp. 1236-1240. (10.1016/j.cub.2017.03.015)
2015
- Walton, S. K.et al. 2015. Limitations in artificial spin ice path selectivity: the challenges beyond topological control. New Journal of Physics 17, article number: 13054. (10.1088/1367-2630/17/1/013054)
2013
- Ladak, S.et al. 2013. Observation of wrinkle induced potential drops in biased chemically derived graphene thin film networks. Carbon 64, pp. 35-44.
- Zeissler, K.et al. 2013. The non-random walk of chiral magnetic charge carriers in artificial spin ice. Scientific Reports 3, article number: 1252. (10.1038/srep01252)
2012
- Ladak, S.et al. 2012. Disorder-independent control of magnetic monopole defect population in artificial spin-ice honeycombs. New Journal of Physics 14(4), article number: 45010. (10.1088/1367-2630/14/4/045010)
- Branford, W. R.et al. 2012. Emerging chirality in artificial spin ice. Science 335(6076), pp. 1597-1600. (10.1126/science.1211379)
2011
- Ladak, S.et al. 2011. Direct observation and control of magnetic monopole defects in an artificial spin-ice material. New Journal of Physics 13, article number: 63032. (10.1088/1367-2630/13/6/063032)
- Gilbertson, A. M.et al. 2011. Sub-100-nm negative bend resistance ballistic sensors for high spatial resolution magnetic field detection. Applied Physics Letters 98(6), article number: 62106. (10.1063/1.3554427)
- Ladak, S.et al. 2011. Monopole defects and magnetic Coulomb blockade. New Journal of Physics 13(2), article number: 23023. (10.1088/1367-2630/13/2/023023)
2010
- Davidson, A. J.et al. 2010. Defect trajectories and domain-wall loop dynamics during two-frequency switching in a bistable azimuthal nematic device. Physical Review E: Statistical, Nonlinear, and Soft Matter Physics 81(5), article number: 51712. (10.1103/PhysRevE.81.051712)
- Ladak, S.et al. 2010. Direct observation of magnetic monopole defects in an artificial spin-ice system [Letter]. Nature Physics 6(5), pp. 359-363. (10.1038/nphys1628)
2009
- Hirohata, A.et al. 2009. Si segregation in polycrystalline Co2MnSi films with grain-size control. Applied Physics Letters 95(25), article number: 252506. (10.1063/1.3276073)
- Ladak, S.et al. 2009. Magnetic and structural properties of laminated Co65Fe35 films. Journal of Magnetism and Magnetic Materials 321(8), pp. 996-1000. (10.1016/j.jmmm.2008.03.019)
- Ladak, S.et al. 2009. Sidewall control of static azimuthal bistable nematic alignment states. Journal of Physics D: Applied Physics 42(8), article number: 85114. (10.1088/0022-3727/42/8/085114)
2008
- Ladak, S., Fernandez-Outon, L. E. and O'Grady, K. 2008. Influence of seed layer on magnetic properties of laminated Co65Fe35 films. Journal of Applied Physics 103(7), article number: 07B514. (10.1063/1.2832436)
2006
- Telling, N. D.et al. 2006. Evidence of a barrier oxidation dependence on the interfacial magnetism in Co/alumina based magnetic tunnel junctions. Journal of Applied Physics 99(8), pp. 0. (10.1063/1.2171002)
2005
- Ladak, S. and Hicken, R. J. 2005. Evidence for hot electron magnetocurrent in a double barrier tunnel junction device. Applied Physics Letters 87(23), article number: 232504. (10.1063/1.2140480)
- Ladak, S. and Hicken, R. J. 2005. Origin of large magnetocurrent in three-terminal double-barrier magnetic tunnel junctions. Journal of Applied Physics 97(10), article number: 104512. (10.1063/1.1905790)
- Keatley, P. S.et al. 2005. Use of microscale coplanar striplines with indium tin oxide windows in optical ferromagnetic resonance measurements. Journal of Applied Physics 97(10), article number: 10R304. (10.1063/1.1849071)
2004
- Telling, N. D.et al. 2004. Spin polarization and barrier-oxidation effects at the Co/alumina interface in magnetic tunnel junctions. Applied Physics Letters 85(17), pp. 3803-3805. (10.1063/1.1812383)
2003
- Hicken, R. J.et al. 2003. Optical ferromagnetic resonance studies of thin film magnetic structures. Journal of Physics D: Applied Physics 36(18), pp. 2183-2192. (10.1088/0022-3727/36/18/002)
Teaching
I am currently on research leave.
The focus of my work is upon 3D magnetic nanostructure fabrication and characterisation using non-linear optical techniques.
Over the past several years I have secured > £1.2M of external (EPSRC) funding as well as small grants from the Royal Society, Welsh Crucible and Cardiff.
I routinely work with other academics from other leading universities (Exeter, Bristol, Southampton) as well as large international research labs (eg. IBM Zurich).
More details of my laboratory and research can be found at my website below:
http://www.ladaklab.com
