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Dr. Jonathan White

Leader Solid State Structures, SANS-I

Paul Scherrer Institute
Forschungsstrasse 111
5232 Villigen PSI
Switzerland
Telephone
+41 56 310 42 84
Email
jonathan.white@psi.ch






Professional Course

Since 2021 Group Leader: Solid State Structures, Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, CH link
Since 2016 Senior Scientist, Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, CH
2013-2016 Tenure-Track Scientist, Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, CH
2011-2013 Postdoctoral Research Fellow, Laboratory for Quantum Magnetism, EPFL, CH link
2009-2013 Postdoctoral Research Fellow, Laboratory for Neutron Scattering, Paul Scherrer Institut, CH
2006-2009 Ph.D. studies, Condensed Matter Physics Group, Department of Physics and Astronomy, University of Birmingham, UK
Ph.D. Thesis: SANS Investigations of the Flux Line Lattice in Unconventional Superconductors
link
2006 Summer Stagiaire Programme, Institut Laue-Langevin, Grenoble, FR link
2002-2006 MSci in Physics at the University of Birmingham, UK
Masters Thesis: Hybrid Device Structures Based on Normal Metal - High Temperature Superconductor Contacts
link

Interests and Responsibilities

My principal scientific interests are in experimental Condensed Matter Physics, where I use mainly neutron scattering to attack various problems. Topics of current interest include:

  • Search for novel magnetic phases in topological materials
  • Topological magnetism, mainly in non-centrosymmetric lattices
  • Microscopic mechanisms for magnetoelectric coupling, in both thin film and bulk materials
  • Interaction between superconductivity and other orders
  • Realization of challenging experiments, e.g. complex sample environments, small sample volumes, pressure experiments.
  • Responsible for the SANS-I instrument at SINQ.

Projects and Collaborative Activities

  • Title: Discovery of new quantum effects derived from synergies between magnetism and Weyl electrons, Role: PI with N. Kanazawa (Univ. of Tokyo), Sponsor: ETHZ (Research Partnership Grant), Funds: 25 kCHF, Jun 2022- May 2023
  • Title: Creation and exploration of high-density topological skyrmion phases in 4f magnets, Role: PI, Sponsor: SNSF (Project), Funds: 0.46 MCHF, Nov 2020 to Oct 2024
  • Title: Discovery and Nanoengineering of Novel Skyrmion-hosting materials, Role: co-PI (with Prof. D. Grundler (EPFL, PI), Prof. O. Yazyev (EPFL, co-PI) and Prof. M. Poggio (UBasel, co-PI)), Sponsor: SNSF (Sinergia), Funds: 2.7 MCHF (personal share 0.7 MCHF), Oct 2017 to Sep 2022 - Project website hosted by EPFL
  • Title: Exploration of emerging magnetoelectric coupling effects in new materials, Role: PI, Sponsor: SNSF (Project), Funds: 0.2 MCHF, Jul 2015 to Jun 2018

Selected publications

Full list at Publons or Google Scholar

Neutron Techniques: Flux-Line Lattice
J. White.
Chapter G1.6 in "Handbook of Superconductivity: Characterization and Applications", 2nd Edition, Eds. D.A. Cardwell, D.C. Larbalestier, A. Braginski, CRC Press - Boca Raton, (2022)

Tuning topological spin textures in size-tailored chiral magnet insulator particles
P.R. Baral, V. Ukleev, R. Cubitt, T. LaGrange, I. Živković, H.M. Rønnow, J.S. White, and A. Magrez.
J. Phys. Chem. C 126, 11855 (2022)

Square and rhombic lattices of magnetic skyrmions in a centrosymmetric binary compound
R. Takagi, N. Matsuyama, V. Ukleev, L. Yu, J.S. White, S. Francoual, J.R.L. Mardegan, S. Hayami, H. Saito, K. Kaneko, K. Ohishi, Y. Onuki, T. Arima, Y. Tokura, T. Nakajima, and S. Seki.
Nature Communications 13, 1472 (2022)

Frustration-driven magnetic fluctuations as the origin of the low-temperature skyrmion phase in Co7Zn7Mn6
V. Ukleev, K. Karube, P.M. Derlet, C.N. Wang, H. Luetkens, D. Morikawa, A. Kikkawa, L. Mangin-Thro, A.R. Wildes, Y. Yamasaki, Y. Yokoyama, L. Yu, C. Piamonteze, N. Jaouen, Y. Tokunaga, H. M. Rønnow, T. Arima, Y. Tokura, Y. Taguchi, and J.S. White
npj Quantum Materials 6, 40 (2021)

Direct Observation of the Statics and Dynamics of Emergent Magnetic Monopoles in a Chiral Magnet
N. Kanazawa†, A. Kitaori†, J. S. White†, V. Ukleev, H. M. Rønnow, A. Tsukazaki, M. Ichikawa, M. Kawasaki, and Y. Tokura
Phys. Rev. Lett. 125, 137202 (2020)

Magnetism and anomalous transport in the Weyl semimetal PrAlGe: possible route to axial gauge fields
D. Destraz, L. Das, S.S. Tsirkin, Y. Xu, T. Neupert, J. Chang, A. Schilling, A.G. Grushin, J. Kohlbrecher, L. Keller, P. Puphal, E. Pomjakushina, and J.S. White
npj Quantum Materials 5, 5 (2020)

Topological magnetic phase in the candidate Weyl semimetal CeAlGe
P. Puphal, V. Pomjakushin, N. Kanazawa, V. Ukleev, D.J. Gawryluk, J.-Z. Ma, M. Naamneh, N.C. Plumb, L. Keller, R. Cubitt, E. Pomjakushina and, J.S. White
Phys. Rev. Lett. 124, 017202 (2020)

Multiple-q noncollinear magnetism in an itinerant hexagonal magnet
R. Takagi, J.S. White, S. Hayami, R. Arita, D. Honecker, H.M. Rønnow, Y. Tokura, and S. Seki
Science Advances, 4, eaau3402 (2018).

Disordered skyrmion phase stabilized by magnetic frustration in a chiral magnet
K. Karube†, J.S. White†, D. Morikawa, C.D. Dewhurst, R. Cubitt, A. Kikkawa, X.Z. Yu, Y. Tokunaga, T. Arima, H.M. Rønnow, Y. Tokura, and Y. Taguchi
Science Advances, 4, eaar7043 (2018).

Magnetoelectric inversion of domain patterns
N. Leo†, V. Carolus†, J.S. White, M. Kenzelmann, M. Hudl, P. Toledano, T. Honda, T. Kimura, S.A. Ivanov, M. Weil, Th. Lottermoser, D. Meier, and M. Fiebig
Nature 560, 466 (2018).

Coupled multiferroic domain switching in the canted conical spin spiral system Mn2GeO4
T. Honda†, J.S. White†, A.B. Harris, L.C. Chapon, A. Fennell, B. Roessli, O. Zaharko, M. Kenzelmann, and T. Kimura
Nature Communications 8, 15457 (2017).

Robust metastable skyrmions and their triangular–square lattice structural transition in a high-temperature chiral magnet
K. Karube†, J.S. White†, N. Reynolds, J.L. Gavilano, H. Oike, A. Kikkawa, F. Kagawa, Y. Tokunaga, H.M. Rønnow, Y. Tokura, and Y. Taguchi
Nature Materials 15, 1237 (2016).

Néel-type Skyrmion Lattice with Confined Orientation in the Polar Magnetic Semiconductor GaV4S8
I. Kézsmárki, S. Bordács, P. Milde, E. Neuber, L.M. Eng, J.S. White, H.M. Rønnow, C.D. Dewhurst, M. Mochizuki, K. Yanai, H. Nakamura, D. Ehlers, V. Tsurkan, and A. Loidl
Nature Materials 14, 1116 (2015).

A new class of chiral materials hosting magnetic skyrmions beyond room temperature
Y. Tokunaga, X.Z. Yu, J.S. White, H.M. Rønnow, D. Morikawa, Y. Taguchi, and Y. Tokura
Nature Communications 6, 7638 (2015).

Electric field-induced Skyrmion distortion and giant lattice rotation in the magnetoelectric insulator Cu2OSeO3
J.S. White, K. Prša, P. Huang, A.A. Omrani, I. Živković, M. Bartkowiak, H. Berger, A. Magrez, J.L. Gavilano, G. Nagy, J. Zang, and H.M. Rønnow
Phys. Rev. Lett. 113, 107203 (2014).

Strain-Induced Ferromagnetism in Antiferromagnetic LuMnO3 Thin Films
J.S. White, M. Bator, Y. Hu, H. Luetkens, J. Stahn, S. Capelli, S. Das, M. Döbeli, Th. Lippert, V.K. Malik, J. Martynczuk, A. Wokaun, M. Kenzelmann, Ch. Niedermayer, and C.W. Schneider
Phys. Rev. Lett. 111, 037201 (2013).

Coupling of Magnetic and Ferroelectric Hysteresis by a Multicomponent Magnetic Structure in Mn2GeO4
J.S. White, T. Honda, K. Kimura, T. Kimura, Ch. Niedermayer, O. Zaharko, A. Poole, B. Roessli, and M. Kenzelmann
Phys. Rev. Lett. 108, 077204 (2012).

Fermi Surface and Order Parameter Driven Vortex Lattice Structure Transitions in Twin-Free YBa2Cu3O7
J.S. White, V. Hinkov, R.W. Heslop, R.J. Lycett, E.M. Forgan, C. Bowell, S. Strässle, A.B. Abrahamsen, M. Laver, C.D. Dewhurst, J. Kohlbrecher, J.L. Gavilano, J. Mesot, B. Keimer, and A. Erb
Phys. Rev. Lett. 102, 097001 (2009).

Superconducting Vortices in CeCoIn5: Toward the Pauli-Limiting Field
A.D. Bianchi, M. Kenzelmann, L. DeBeer-Schmitt, J.S. White, E.M. Forgan, J. Mesot, M. Zolliker, J. Kohlbrecher, R. Movshovich, E.D. Bauer, J.L. Sarrao, Z. Fisk, C. Petrović, and M.R. Eskildsen
Science 319, 177 (2008).

Recent Presentations

Frustration-driven magnetic fluctuations as the origin of the low-temperature skyrmion phase in Co7Zn7Mn6 Invited talk at 84th DPG Meeting, DE (delivered online) 28.09.2021
Multi-k magnetic phases and topological charges in the candidate Weyl semimetal CeAlGe Invited Talk, IUCr 2021, Prague, CZ (delivered online) 16.08.2021
Exploring Magnetic Skyrmions in Co-Zn-Mn Compounds: From Far-From-Equilibrium States to Effects of Magnetic Frustration Invited Talk, 2021 MRS Spring Meeting, Seattle, US (delivered online) 21.04.2021
Topological magnetic phase in the candidate Weyl  semimetal CeAlGe Invited Talk, 6th RIKEN CEMS Topical Meeting, Wako, JP (delivered online) 01.12.2020
Magnetic skyrmions at room temperature and far-from-equilibrium Condensed Matter Seminar (Invited), University of Notre Dame, US (delivered online) 27.08.2020
Magnetic skyrmions at room temperature and far-from-equilibrium PSI Condensed Matter Colloquium (Invited), Paul Scherrer Institut, CH 24.01.2020
Multiple-q noncollinear magnetism in the itinerant hexagonal magnet Y3Co8Sn4 Contributed Talk, Topology in Magnetism: Theory Meets Experiment (TME) Workshop 2019, La Plata, AR 22.10.2019
Multiple-q noncollinear magnetism in the itinerant hexagonal magnet Y3Co8Sn4 Contributed Talk, European Conference on Neutron Scattering (ECNS) 2019, Saint-Petersburg, RU 04.07.2019
Application of scattering techniques for the study of skyrmionics Invited Lecture at FASEM School, Lund, SE 13.05.2019

Colleagues


In addition to other LNS members, I also work with the below-listed scientists and their group members. Please take a moment to visit their webpages.
Dr. M. Bartkowiak, LIN, PSI link
Prof. E. Blackburn, Lund University, Sweden link
Prof. S. Bordács, BUTE, Hungary link
Prof. J. Chang, Universität Zürich link
Dr. R. Cubitt, Dr. C.D. Dewhurst, Institut Laue-Langevin, France link
Prof. M.R. Eskildsen, University of Notre Dame, USA link
Prof. E.M. Forgan, University of Birmingham, UK link
Prof. T. Kimura, Department of Applied Physics, University of Tokyo, Japan link
Dr. E. Pomjakushina, LMX, PSI link
Prof. H.M. Rønnow, Dr. I. Živković, Dr. A. Magrez, EPFL link
Prof. Y. Tokura, Dr. N. Kanazawa, Department of Applied Physics, University of Tokyo, Japan link
Prof. Y. Tokura, Prof. Y. Taguchi, Dr. K. Karube, RIKEN CEMS, Wako, Japan link
Prof. Y. Yasui, Meiji University, Japan link

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