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{Application of magneto-optical Kerr effect to first-order reversal curve measurements}




First-order reversal curves (FORC) are a powerful method for magnetic sample characterization, separating all magnetic states of an investigated system according to their coercivity and internal magnetic interactions. A major drawback of using measurement techniques like VSM or SQUID, typically applied for FORC acquisition, is the long measurement time, limiting the resolution and the number of measurements due to time constraints. Faster techniques like MOKE result in problems regarding measurement stability over the curse of the acquisition of many minor loops, due to drift and non-absolute magnetization values. Here, we present an approach using a specialized field shape providing two anchor points for each minor loop for applying the magneto-optical Kerr effect (MOKE) technique to FORC measurements. This results in a high field resolution while keeping the total acquisition time to only a few minutes. MOKE FORC measurements are exemplarily applied to a simple permalloy film, an exchange-bias system, and a Gd/Fe multilayer system with perpendicular magnetic anisotropy, showcasing the versatility of the method.

Author(s): Gräfe, J. and Schmidt, M. and Audehm, P. and Schütz, G. and Goering, E.
Journal: {Review of Scientific Instruments}
Volume: 85
Year: 2014
Publisher: American Institute of Physics

Department(s): Moderne Magnetische Systeme
Research Project(s): First-Order Reversal Curves
Bibtex Type: Article (article)

Address: Woodbury, N.Y. [etc.]
DOI: 10.1063/1.4865135
Language: eng


  title = {{Application of magneto-optical Kerr effect to first-order reversal curve measurements}},
  author = {Gr\"afe, J. and Schmidt, M. and Audehm, P. and Sch\"utz, G. and Goering, E.},
  journal = {{Review of Scientific Instruments}},
  volume = {85},
  publisher = {American Institute of Physics},
  address = {Woodbury, N.Y. [etc.]},
  year = {2014}