Nanoscale Magnetic Materials - Magnetic Domains

Hybrid magnetic materials (finished project)

Advanced Materials

Hybrid magnetic materials - microscopic modifications resulting in macroscopic effects

Understanding the correlation of artificial magnetic domain configurations and effective magnetic characteristics, such as the anisotropy, exchange coupling, and interlayer exchange coupling is the main goal of the research project. Artificial magnetic structures are produced with the aid of ion irradiation techniques in order to modify magnetic characteristics on a length scale comparable to or below the magnetic characteristic correlation lengths. By this, completely new domain wall and domain configurations are imprinted that do not occur in conventional film systems. With the progressive reduction in structure size materials with modified effective magnetic properties, so-called magnetic hybrid materials, are generated. 

The current focus of the project is on the investigation of the functional relationship between microscopic magnetic property patterns and the integrally measured effective magnetic parameters. The scalability of the findings are examined by the comparison of different material systems with varying effective magnetic correlation lengths.

Hybrid magnetic materials project at DFG Gepris 


  1. J. Osten, K. Lenz, H. Schultheiss, J. Lindner, J. McCord, J. Fassbender, Interplay between magnetic domain patterning and anisotropic magnetoresistance probed by magneto-optics, Physical Review B 97, 014415 (2018)
  2. J. Trützschler, K. Sentosun, B. Mozooni, R. Mattheis, J. McCord. Magnetic domain wall gratings for magnetization reversal tuning and confined dynamic mode localization, Scientific Reports 6, 30761 (2016) 
  3. J. Trützschler, K. Sentosun, M. Langer, I. Mönch, R. Mattheis, J. Fassbender, J. McCord, Optimization of magneto-resistive response of ion-irradiated exchange biased films through zigzag arrangement of magnetization, Journal of Applied Physics 115, 103901 (2014) 
  4. M. Langer, A. Neudert, I. Mönch, R. Mattheis, K. Lenz, J. Fassbender, J. McCord, Magneto-optical analysis of stripe elements embedded in a synthetic antiferromagnet, Physical Review B 89, 064411 (2014) 
  5. O. D. Roshchupkina, J. Grenzer, T. Strache, J. McCord, M. Fritzsche, A. Muecklich, C. Baehtz, and J. Fassbender, Focused ion beam induced structural modifications in thin magnetic films, Journal of Applied Physics 112, 033901 (2012)  
  6. A. Maziewski, P. Mazalski, Z. Kurant, M. O. Liedke, J. McCord, J. Fassbender, J. Ferré, A. Mougin, A. Wawro, L. T. Baczewski, A. Rogalev, F. Wilhelm, and T. Gemming, Tailoring of magnetism in Pt/Co/Pt ultrathin films by ion irradiation, Phys. Rev. B 85, 054427 (2012)
  7. J. McCord, T. Strache, I. Mönch, R. Mattheis, J. Fassbender, Spatial manipulation of magnetic damping in ferromagnetic-antiferromagnetic films by ion irradiation, Physical Review B 83, 224407 (2011)
  8. A. Vogel, S. Wintz, T. Gerhardt, L. Bocklage, T. Strache, M.-Y. Im, P. Fischer, J. Fassbender, J. McCord, G. Meier, Field- and current-induced domain-wall motion in permalloy nanowires with magnetic soft spots, Applied Physics Letters 98, 20250 (2011)
  9. N. Martin, I. Mönch, R. Schäfer, J. Fassbender, L. Schultz, J. McCord, Influence of dipolar energy on the magnetization reversal in magnetization-modulated thin film systems: Model and experiment, Physical Review B 83, 174423 (2011)
  10. J. Fassbender, T. Strache, M.O. Liedke, D. Markó, S. Wintz, K. Lenz, A. Keller, S. Facsko, I. Mönch, J. McCord, Introducing arti?cial length scales to tailor magnetic properties, New Journal of Physics, New Journal of Physics 11, 125002/1-19 (2009)
  11. N. Martin, J. McCord, A. Gerber, T. Strache, T. Gemming, I. Mönch, N. Farag, R.Schäfer, J. Fassbender, E. Quandt, L. Schultz, Local stress engineering of magnetic anisotropy in soft magnetic thin films, Applied Physics Letter 94, 062506 (2009)
  12. J. McCord, I. Mönch, J. Fassbender, A. Gerber, E. Quandt, Local setting of magnetic anisotropy in amorphous Films by Co ion implantation, J. Phys. D 42, 055006 (2009)
  13. J. Fassbender, J. McCord, Magnetic patterning by means of ion irradiation and implantation (Review), Journal of Magnetism and Magnetic Materials 320, 579 (2008)
  14. J. McCord, L. Schultz, J. Fassbender, Hybrid soft-magnetic lateral exchange spring films prepared by ion irradiation, Advanced Materials 20, 2090 (2008)
  15. J. Fassbender, J. von Borany, A. Mücklich, K. Potzger, W. Möller, J. McCord, L. Schultz, R. Mattheis, Structural and magnetic modifications of Cr-implanted permalloy, Physical Review B 73, 184410 (2006)
  16. J. Fassbender, J. McCord, Control of saturation magnetization, anisotropy, and damping due to Ni implantation in thin Ni81Fe19 layers, Applied Physics Letters 88, 252501 (2006)
  17. K. Potzger, L. Bischoff, M. O. Liedke, B. Hillebrands, M. Rickart, P. P. Freitas, J. McCord, J. Fassbender, Domain structure of magnetically micro-patterned PtMn/NiFe exchange biased bilayers, IEEE Trans. Magn. 41, 3610 (2005)
  18. J. McCord, J. Fassbender, M.O. Liedke, M. Frommberger, T. Gemming, E. Quandt, L. Schultz, Magnetic anisotropy and domain patterning of amorphous films by He-ion irradiation, Applied Physics Letters 86, 162505 (2005)