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Nanoscale magnetic structures enables many interesting science as the structure dimensions become comparable to characteristic length scales, which has immediate application in magnetic data storage, magnetic memory and spintronics devices. Moreover, the order between nanostructures as in patterned arrays, becomes crucial as the mesoscopic effects produced by the confinement and proximity can be controlled and modified by their geometrical configuration. Ordered arrays of nanostructures are particularly interesting to study, as one can probe both the individual and collective behavior of the elements. The most important properties that of interest to study is at nanoscale where change can happen in smaller time scales (e.g. fluctuation of magnetic domain wall, ultrafast demagnetization), so the challenge is to understand science of ultra-small structures at ultra-fast time scales. We are using laboratory based experimental techniques as well as large scale facility (neutron and synchrotron radiation based techniques) to characterize/observe the nano-scale properties.

Research Topics:
  • Thin Film Magnetism and Data Storage 
  • Magnetic Imaging (Scanning probe and X-ray based)
  • Ferromagnetic Semiconductor and Spintronics 
  • Exchange Bias phenomena
  • Resonant Magnetic Scattering,  X-ray Holography
  • Ultrafast Magnetism and Free Electron Laser
  • Micromagnetic Simulations
nanomagnetism
Fresh Results
Laser induced local modification of magnetic domain, in JMMM

Highlights:
  • Laser induced magnetization dynamics
  • Local manipulation of magnetic  domains
  • Deterministic switching of domains with laser
  • Modeling magnetic domain with local anisotropy
nanomagnetism
Updates:  
  • March 2017: Spin reorientation paper published in JMMM
  • March 2017: AT (Best Poster award), SA (2nd Best Poster award) at DAE-BRNS symposium at NCCCM/BARC
  • Jan. 2017: Tilt angle magnetic anisotropy paper published in JMMM
  • Dec. 2016: AT (Best Poster award) at IUMRS-ICYRAM 2016
  • Aug. 2016: Patterned media paper published in APA
  • Feb. 2016: Laser induced magnetic domain modification paper published in JMMM.
  • Dec. 2015: JM, AS, AT @ICMAGMA 2015: JM (invited talk), AS (Poster) AT(Best Poster award)
  • Nov. 2015: UFS 2015: JM (invited talk), AT(Best Poster award)
  • Feb. 2015: Dynamics of Skyrmionic spin structure paper published in Nature Physics.
  • Jan. 2015: AT attended Neutron school (NPCM-2015) at BARC, India
  • Jan. 2015: JM (invited talk) and AT (poster) attended IJWMN 2015 held at NISER, Bhubaneswar, India
  • Oct. 2014: X-ray-induced persistent photoconductivity in vanadium dioxide paper published in PRB.
  • April 2013: Low-pinning high-anisotropy magnetic nanostructures suitable for dynamic imaging paper accepted in PRB.
  • March 2013: Frozen magnetic moments in Exchange bias system paper published in New Journal of Physics.
  • Feb. 2013: Frozen magnetic moments in Exchange bias system paper accepted in New Journal of Physics.
  • Dec. 2012: Holographically aided iterative phase retrieval paper published in Optics Express.
  • Dec. 2012: Talk: Finite difference micromagnetics of nanostructured magnetic element at ICCMS2012.
  • Nov. 2012: Collective pinning dynamics in TaS2 paper published in Physical Review B.
  • Oct. 2012: Ultrafast demagnetization paper published in Nature Communication.
  • Sept. 2012: Collective pinning dynamics in TaS2 paper accepted in PRB.
  • August 2012: Ultrafast demagnetization paper accepted in Nature Communication.
  • August 2012: Holographically aided phase retrieval paper accepted in Optics Express.
  • July 2012: NiFe/FeMn exchange bias paper published in Applied Physics A.
  • June 2012: Femto-second imaging of ferromagnetic domain paper published in PRL.
  • May 2012: Single shot coherent diffractive magnetic domain imaging paper published in PRL.
Selected Publication: (For complete list see  Publication Page
  • F. Büttner, C. Moutafis, M. Schneider, B. Kruüger, C.M. Günther, J. Geilhufe, C.v. Korff Schmising, J. Mohanty,, B. Pfau, S. Schaffert, A. Bisig, M. Foerster, T. Schulz, C. A. F. Vaz, J. H. Franken, H. J. M. Swagten, M. Klaüui, S. Eisebitt, Dynamics and inertia of skyrmionic spin structures, Nature Physics, 2 Feb. 2015 DOI: 10.1038/nphys3234.
  • B. Pfau, S. Schaffert, L. Müller, C. Gütt, A. Al-Shemmary, F. Büttner, R. Delaunay, S. Düsterer, S. Flewett, R. Frömter, J. Geilhufe, E. Guehrs, C.M. Günther, R. Hawaldar, M. Hille, N. Jaouen, A. Kobs, K. Li, J. Mohanty, et. al, Ultrafast optical demagnetization manipulates nanoscale spin structure in domain walls, Nature Communication,(2.Oct 2012 DOI: 10.1038/ncomms2108.
  • J.-D. Su, A. R. Sandy, J. Mohanty, O. G. Shpyrko and M. Sutton, Collective pinning dynamics of charge density waves in 1T-TaS2, Phys. Rev. B ( 86, 205105 (2012).
  • J. Mohanty,  S. Vandezande, S. Brems, M. J. Van Bael, T. Charlton, S. Langridge, R. M. Dalgliesh, K. Temst, and C. Van Haesendonck, Magnetization reversal studies of continuous and patterned exchange biased NiFe/FeMn thin films, Applied Physics A ( DOI 10.1007/s00339-012-7031-2 (2012).
  • Samuel Flewett, Stefan Schaffert, Jyoti Mohanty, Erik Guehrs, Jan Geilhufe, Christian M. Günther, Bastian Pfau and Stefan Eisebitt, Method for Single-Shot Coherent Diffractive Imaging of Magnetic Domains, PRL, ( 108, 223902 (2012).
  • T. Wang, D. Zhu, B. Wu, C. Graves, S. Schaffert, T. Rander, L. Müller, B. Vodungbo, C. Baumier, D. P. Bernstein, B. Bräuer, V. Cros, S. Jong, R. Delaunay, A. Fognini, R. Kukreja, S. Lee, V. Lopez-Flores, J. Mohanty et. al. , Femtosecond Single-Shot Imaging of Nanoscale Ferromagnetic Order in Co/Pd Multilayers Using Resonant X-Ray Holography, PRL, ( 108, 267403 (2012).
  • A. Tripathi, J. Mohanty, O. G. Shpyrko, E. Shipton, E. E. Fullerton, S. S. Kim and I. McNulty, Dichroic coherent diffractive imaging, PNAS, ( 108(33)}, 13393-13398 (2011).

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