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Hans-Benjamin Braun

Associate Professor

School of Physics
UCD Science Centre
Belfield
Dublin 4

Tel: +353 (1) 716 2564
Email: beni.braun@ucd.ie

Biography


2014                  IEEE Magnetics Society Distinguished Lecturer
2007 -                Associate Professor, University College Dublin, Ireland
2006 -  2008       Director, UCD Theoretical Physics Programme
2004 -  2007       Lecturer in Theoretical Physics and Applied Mathematics, 
                                University College Dublin, Ireland
2003 -  2004       Visiting Lecturer, Theoretical Physics, ETH Zurich, Switzerland
2002 -  2003       Visiting Scientist, Institute Laue-Langevin (ILL) Grenoble, France
1996 -  2002       Senior Scientist, Paul Scherrer Institute (ETHZ) Villigen, Switzerland
1994 -  1996       NSERC Canada  International Fellow, Simon Fraser University,  
                                 Vancouver, Canada
1993 -  1994       Research Scientist, Center for  Magnetic Recording Research, 
                                 UC San Diego
1992 -  1994       SNF Postdoctoral Fellow, Department of Physics, UC San Diego
1991                   PhD, ETH Zurich, Switzerland


Visiting researcher at:     ETH Zurich
                                     Institute for Theoretical Physics, UC Santa Barbara
                                     California Institute of Technology
                                     Courant Institute for Mathematical Sciences,
                                        New York University
                                     Physics Department TU Munich
                                     Institute Laue-Langevin Grenoble 
                                     Department of Physics, University of Basel  

Professional

Honours and Awards

Year: 2014.
Title: IEEE Distinguished Lecturer Award
Year: 1994.
Title: NSERC of Canada International Fellow
Year: 1991.
Title: Advanced Researcher Fellowship (Swiss National Science Foundation )

Associations

Association: American Physical Society, Function/Role: Member
Association: IEEE, Function/Role: Member

Patents

Patent US 8,450,047 B2 : Method of studying chirality controlled artificial kagome spin ice building blocks
Patent US 8,085,578 B2 : Method and system for coding and readout of information in a microscopic cluster comprising coupled functional islands
     

Committees

Committee : Dublin Institute of Advanced Studies - School of Theoretical Physics - Governing Board Member (from 2015)
Committee : MMM-Intermag Conference San Diego 2016, Programme Committee (>2000 participants)
Committee : UCD College of Science Research Committee
Committee : Joint European Magnetic Symposia, JEMS 2008, Organizing Committee
Committee : UCD Science Programme Board
Committee : UCD Seed Funding Committee
Committee : UCD Images of Research Committee
 

Education

Year 1987 Institution: University of Basel
Qualification: MSc Subject: Theoretical Physics
Year 1991 Institution: ETH
Qualification: PhD Subject: Theoretical Physics

Languages

German:
French:

Consultancy

Client: Dublin Institute of Advanced Studies - School of Theoretical Physics
Client: US National Science Foundation
Client: European Research Agency (ERC Advanced Grants)
Client: EPSRC Great Britain
Client: NSERC of Canada
Client: ANR France
Client: Netherlands Organisation for Scientific Research (NWO)
Client: FONDECYT (Chilean National Science and Techn. Commission)
Client: Swiss National Science Foundation

Outreach Activities

2014 IEEE Distinguished Lecturer (International Educational Outreach)

Invited Lecturer at 2014 IEEE Summer School (Rio de Janeiro, Brazil, Aug  10-16, 2014)

Journals Edited

Scientific Reports: Editorial Board member.
Nature Physics: Senior Reviewer.
Nature Nanotechnology: Senior Reviewer.
Physical Review Letters: Senior Reviewer.
Nature: Reviewer.
 

Publications

 

Book Chapters

Braun HB; (2003) 'Solitons, Instantons and Mesoscopic Quantum Phenomena in Magnetism' In: Friedman, Jonathan R. ; Han, Siyuan (eds). Exploring the Quantum/Classical Frontier: Recent Advances in Macroscopic Quantum Phenomena. , pp.253-298 [Details]
Braun HB; (2000) 'Stochastic Magnetization Dynamics in Magnetic Nanostructures - From Néel-Brown to Soliton-Antisoliton Creation' In: Entel P, Wolf DE (eds). Structure and Dynamics of Heterogeneous Systems, World Scientific. , pp.274-293 [Details]
Braun HB; (1998) 'Topological Excitations in Low Dimensional Magnets' In: Furrer A (ed) (eds). Complementarity between Neutron and Synchrotron X-Ray Scattering. , pp.129-162 [Details]
Braun HB, Loss D; (1995) 'Macroscopic Quantum Coherence of Bloch Walls' In: Gunther L and Barbara B (eds). Quantum Tunneling of the Magnetization - QTM 94 NATO ASI SERIES, Kluwer. [Details]

Edited Books

R.W. Chantrell, H.B. Braun, R. Sessoli (Ed.). (2009) J. Magn. Magn. Mat., Proceedings of Joint European Magnetic Symposia JEMS 2008. Amsterdam: Elsevier. [Details]

Peer Reviewed Journals

Y. Zhou, E. Iacocca, A. Awad, R. K. Dumas, F. C. Zhang, H. B. Braun, and J. Åkerman (2015) 'Dynamically stabilized magnetic skyrmions'. Nature Communications, . Available Online [DOI] [Details]
F. Ma, Y. Zhou, H. B. Braun, W.S. Lew (2015) 'A skyrmion based dynamic magnonic crystal'. Nano Letters, 15 :4029-4036. Available Online [DOI] [Details]
H.B. Braun (2014) 'Quenching the Fire in Spin Ice'. Nature Physics, 10 . Available Online [DOI] [Details]
Hans-Benjamin Braun, Remo Hugli, Laura Heyderman (2014) 'Nordpole ohne Südpole (Scientific American, German Edition)'. Scientific American, . Available Online [Details]
R V Chopdekar, G Duff, R V Hugli, E Mengotti, D A Zanin, L J Heyderman, H B Braun (2013) 'Controlling vortex chirality in hexagonal building blocks of arti'. New Journal of Physics, . Available Online [DOI] [Details]
Hans-Benjamin Braun, Remo Hugli, Laura Heyderman (2013) 'Les aimant qui perdent le nord, Pour La Science (Scientific American, French Edition)'. Scientific American, . Available Online [Details]
R.V. Hugli, G. Duff, B. O'Conchuir, E. Mengotti, L.J. Heyderman, A. Fraile Rodriguez, F. Nolting, H.B. Braun (2012) 'Artifical kagome spin ice: dimensional reduction, avalanche control and emergent magnetic monopoles'. Philosophical Transactions of the Royal Society A, 370 (1981):5768-5783. [DOI] [Details]
H.B. Braun; (2012) 'Topological Effects in Nanomagnetism - From superparamagnetism to chiral quantum solitons'. Advances In Physics, 61 (1):1-116. Available Online [Details]
G. Fiedler, J. Fidler, J. Lee, T. Schrefl, R. L. Stamps, H. B. Braun, and D. Suess (2012) 'Direct calculation of the attempt frequency of magnetic structures using the finite element method'. Journal of Applied Physics, . [Details]
R.V. Hugli, G. Duff, B. O'Conchuir, A. Fraile Rodriguez, F. Nolting, L. Heyderman, H.B. Braun; (2012) 'Emergent magnetic monopoles, disorder and avalanches in artificial kagome spin ice (invited)'. Journal of Applied Physics, 111 . [Details]
N. Grisewood, J. Eves, T. Usher, H.B. Braun; (2012) 'Chiral magnetization configurations in magnetic nanostructures in the presence of Dzyaloshinski-Moriya interactions'. Journal of Applied Physics, 111 . [Details]
E. Mengotti, L.J. Heyderman, A. Fraile Rodriguez, F. Nolting, R.V. Hugli, H.B. Braun ; (2011) 'Real space observation of emergent magnetic monopoles and associated Dirac strings in artificial kagome spin ice'. Nature Physics, 7 (1):68-74. [Details]
L. Heyderman, F. Nolting, H.B. Braun ; (2011) 'Monopole aus Nanomagneten'. Spektrum der Wissenschaft (March 2011). [Details]
J.L.Eves, N. Grisewood, R.V. Hugli, H.B. Braun; (2010) 'Breather states in magnetic domain wall racetrack memory samples'. Journal of Magnetism & Magnetic Materials, 322 . [Details]
C.D. Pemmaraju, R. Hanafin, T. Archer, H.B. Braun and S. Sanvito; (2008) 'Impurity-Ion pair induced high-TC ferromagnetism in Cobalt doped Zinc-Oxide'. Physical Review B-Condensed Matter, . [Details]
Mengotti, E,Heyderman, LJ,Fraile Rodriguez, A,Bisig, A,Le Guyader, L,Nolting, F,Braun, HB; (2008) 'Building blocks of an artificial kagome spin ice: Photoemission electron microscopy of arrays of ferromagnetic islands'. Physical Review B - Condensed Matter and Materials Physics, 78 . [DOI] [Details]
Pemmaraju, CD,Hanafin, R,Archer, T,Braun, HB,Sanvito, S; (2008) 'Impurity-ion pair induced high-temperature ferromagnetism in Co-doped ZnO'. Physical Review B - Condensed Matter and Materials Physics, 78 . [DOI] [Details]
Löffler JF, Braun HB; (2007) 'Magnetization response in bulk nanostructured magnets'. Materials Science and Engineering A, 449 :407-413. [Details]
Braun HB, Kulda J, Roessli B, Visser D, Krämer KW, Güdel HU, Böni P; (2007) 'Chiral quantum excitations in the anisotropic antiferromagnet CsCoBr3'. Journal of Magnetism & Magnetic Materials, 310 . [Details]
Binz B, Braun HB, Rice TM, Sigrist M ; (2006) 'Magnetic domain formation in itinerant metamagnets'. Physical Review Letters, 96 (19):196406-1-196406-4. [Details]
Braun HB; (2006) 'Scaling Behavior of Thermally Activated Magnetization Reversal in Nanomagnets'. Journal of Applied Physics, 99 (8). [Details]
H.B. Braun, J. Kulda, B. Roessli, D. Visser, K.W. Krämer, H.U. Güdel and P. Böni; (2005) 'Emergence of soliton chirality in a quantum antiferromagnet '. Nature Physics 1 :159-163. [Details]
Schanzer C, Shah VR, Gutberlet T, Gupta M, Boni P, Braun HB ; (2005) 'Magnetic depth profiling of FM/AF/FM trilayers by polarized neutron reflectometry'. Physica B, 356 (1-4):46-50. [Details]
Shah VR, Schanzer C, Boni P, Braun HB; (2005) 'Magnetization reversal in FM/AF/FM trilayers: dependence of AF thickness'. Journal of Magnetism & Magnetic Materials, 286 :484-487. [Details]
Bill A, Braun HB; (2004) 'Magnetic properties of exchange springs'. Journal of Magnetism and Magnetic Materials, 272 :1266-1267. [Details]
Kulda J and Braun HB; (2004) 'Spin Chains with a chiral twist'. Highlights of ILL Research: Neutrons and Magnetic Materials . [Details]
Zaharko O, Oppeneer PM, Grimmer H, Horisberger M, Mertins HC, Abramsohn D, Schafers F, Bill A, Braun HB; (2002) 'Exchange coupling in Fe/NiO/Co film studied by soft x-ray resonant magnetic reflectivity'. Physical Review B - Condensed Matter and Materials Physics, 66 (13):134406-1-134406-10. [Details]
Löffler JF, Braun HB, Wagner W; (2001) 'Comment on Magnetic correlations in nanostructured ferromagnets - Reply'. Physical Review Letters, 87 (14). [Details]
Löffler JF, Wagner W, Braun HB; (2001) 'Magnetism of nanostructured ferromagnets-experiments and theoretical model'. Scripta Materialia, 44 (8):1425-1429. [Details]
Löffler JF, Braun HB, Wagner W, Kostorz G, Wiedenmann A; (2001) 'Crossover in the magnetic properties of nanostructured metals'. Materials Science and Engineering A, 304 :1050-1054. [Details]
Löffler JF, Braun HB, Wagner W; (2000) 'Magnetic correlations in nanostructured ferromagnets'. Physical Review Letters, 85 (9):1990-1993. [Details]
Löffler JF, Braun HB, Wagner W; (1999) 'Magnetic correlations in nanostructured metals and an extended random-anisotropy model'. Journal of Applied Physics, 85 :5187-5189. [Details]
Braun HB; (1999) 'Nucleation in ferromagnetic nanowires-magnetostatics and topology'. Journal of Applied Physics, 85 :6172-6174. [Details]
Braun HB, Fettes N; (1999) 'From micromagnetics to quantum spin chains: Quantization of breathers'. Journal of Applied Physics, 85 :5648-5650. [Details]
Braun HB, Kyriakidis J, Loss D; (1997) 'Macroscopic quantum tunneling of ferromagnetic domain walls'. Physical Review B - Condensed Matter and Materials Physics, 56 :8129-8137. [Details]
Braun HB, Loss D; (1996) 'Berry's phase and quantum dynamics of ferromagnetic solitons'. Physical Review B - Condensed Matter and Materials Physics, 53 :3237-3255. [Details]
Braun HB, Loss D; (1996) 'Chirality correlation of spin solitons: Bloch walls, spin-1/2 solitons and holes in a 2D antiferromagnetic background'. International Journal of Modern Physics, B10 :219-234. [Details]
Braun HB, Loss D; (1996) 'Chiral quantum spin solitons'. Journal of Applied Physics, 79 :6107-6109. [Details]
Braun HB, Loss D; (1995) 'Dissipation and Quantum Propagation of Bloch Walls'. Europhysics Letters, 31 :555-560. [Details]
Braun HB; (1994) 'Fluctuations and Instabilities of Ferromagnetic Domain Wall Pairs in an External Field'. Physical Review B-Condensed Matter, 50 :16485-16500. [Details]
Braun HB, Loss D; (1994) 'Bloch States of a Bloch Wall'. Journal of Applied Physics, 76 :6177-6179. [Details]
Braun HB, Bertram HN; (1994) 'Nonuniform Switching of Single-Domain Particles at Finite Temperatures'. Journal of Applied Physics, 75 :4609-4616. [Details]
Braun HB; (1994) 'Kramers' rate theory, Broken Symmetries and Magnetization Reversal (INVITED)'. Journal of Applied Physics, 76 :6310-6315. [Details]
Braun HB; (1994) 'Statistical Mechanics of Nonuniform Magnetization Reversal'. Physical Review B-Condensed Matter, :16501-16521. [Details]
Braun HB; (1993) 'Thermally Activated Magnetization Reversal in Elongated'. Physical Review Letters, 71 :3557-3560. [Details]
Braun HB, Brodbeck O; (1993) 'Dynamic Confinement of Twisted Soliton Pairs in Biaxial Ferromagnets'. Physical Review Letters, 70 :3335-3338. [Details]
Braun HB; (1991) 'Nucleation Rates for Magnetization Reversal in Biaxial Ferromagnets'. IEEE Transactions on Magnetics, 27 :4787-4789. [Details]
Helman JS, Braun HB, Broz JS, Baltensperger W; (1991) 'General Solution of the Landau-Lifshitz-Gilbert Equations Linearized around a Bloch Wall'. Physical Review B-Condensed Matter, 43 :5908-5914. [Details]
Broz JS, Braun HB, Brodbeck O, Baltensperger W, Helman JS; (1990) 'Nucleation of Magnetization Reversal via Creation of Pairs of Bloch Walls'. Physical Review Letters, 65 :787-789. [Details]
Talkner P, Braun HB; (1988) 'Transition Rates of a Non-Markovian Brownian Particle in a Double Well Potential'. Journal of Chemical Physics, 88 :7537-7549. [Details]

Other Journals

Shah, V.R., Schanzer, C., Böni, P. Braun, H.B.; (2006) 'Interface and Magnetic Characterization of FeCoV/NiO/FeCoV Trilayers' Physics of Metals and Metallography . [Details]
Shah, V.R., Schanzer, C., Böni, P. Braun, H.B.; (2006) 'Interface and Magnetic Characterization of FM/AF/FMTrilayers' NATO ASI Series II 226, Kluwer, Academic Press . [Details]
                                                                                   

Articles

R.W. Chantrell, H.B. Braun, R. Sessoli; (2009) Journal of Magnetism and Magnetic Materials. Articles [Details]
 

Invited Review Articles

Hans-Benjamin Braun, Remo Hügli, Laura Heyderman (2013) Les aimant qui perdent le nord, Pour La Science (Scientific American, French). Paris: Invited Review Articles [DOI] [Details]
Hans-Benjamin Braun, Remo Hugli, Laura Heyderman (2014) Nordpole ohne Südpole, Spektrum der Wissenschaft (Scientific American, German). Stuttgart/London: Invited Review Articles [Details]
 

Research

Research Interests

Condensed Matter Theory: Strongly Correlated Electron Systems; Spintronics; Nanoscale Magnetism

Areas of Interest:
Nanoscale Magnetism, Spintronics, Strongly Correlated Electron Systems, Spin Currents, Macroscopic Quantum Phenomena, Geometric Quantum Phases, Solitons, Chirality, Statistical Mechanics and Phase Transitions, Neutron Scattering and Magnetism

Research Projects

Sponsor : Science Foundation Ireland (SFI)
Title : Physics behind next generation magnetic storage technologies
Start Date / End Date : 01-APR-12 / 01-APR-16
Sponsor : Science Foundation Ireland (SFI)
Title : Synchrotron based photoelectron emission spectroscopy and magnetic charge logic in densely packed arrays of nanoscale islands
Start Date / End Date : 01-OCT-11 / 30-SEP-12
Sponsor : Irish Research Council for Science Engineering and Technology (IRCSET)
Title : Nanoscale Magnetism and Spintronics - Exchange Bias, Racetrack Memories and Spin Transport
Start Date / End Date : 01-DEC-10 / 30-NOV-13
Sponsor : University College Dublin (UCD)
Title : Physics behind next generation magnetic storage technology
Start Date / End Date : 01-JAN-13 / 31-DEC-13
Sponsor : Irish Research Council for Science Engineering and Technology (IRCSET)
Title : Chiral Symmetry Breaking in Magnetic Nanoscale Structures
Start Date / End Date : 01-OCT-08 / 30-SEP-11
Sponsor : Science Foundation Ireland (SFI)
Title : Magnetic ordering and frustration phenomena in 2D nanodot arrays - how small can MRAMs be?
Start Date / End Date : 01-SEP-08 / 31-AUG-12
Sponsor : Irish Research Council for Science Engineering and Technology (IRCSET)
Title : Spintronics and Strongly Corr. Electron Systems - Role of Spin Currents in Nanoscale Ferromagnets
Start Date / End Date : 01-OCT-07 / 30-SEP-10
Sponsor : Science Foundation Ireland (SFI)
Title : Thermal and quantum effects in heterogeneous nanoscale spintronic systems
Start Date / End Date : 01-JUL-06 / 30-JUN-11
   

Collaborators

Internal Collaborators

Remo Hügli          (Research Associate)

Gerard Duff          (Postdoc) 

John Eves             (PhD completed 2012)

Naoise Grisewood   (PhD to be completed in 2015)
 
Leonard English     (PhD completed 2015) 
 
 
 

External Collaborators

ETH Zurich, PSI Villigen, Uni Basel, ILL Grenoble, TU Munich, Univ Hongkong, Gothenburg University, Univ Singapore