MtPh

Probing magnetic microtextures on the nanoscale

date
18.01.2019 
time
01:00 PM - 02:00 PM 
speaker
Dr. Volker Neu 
affiliation
IFW Dresden 
language
en 
main topic
Materials: Superconductors, Magnetic Materials, Nano Structures
subtopics
Physics: Condensed Matter (incl. Soft, Solid)
host
Kristina Krummer 
abstract

Magnetic force microscopy (MFM) has established its place as an extremely valuable method for the investigation of magnetic microstructures on the nanometer scale. Beyond being a purely qualitative imaging technique, quantitative MFM has the capability to locally measure the stray fields and eventually provide quantitative input data for a reconstruction of the underlying magnetization structure. This requires a full calibration of the imaging properties of the MFM tip and the most general approach is through the determination of the so-called tip transfer function (TTF) in Fourier space [1-3]. A calibrated tip transforms MFM signals into true stray field values on the nanometer scale. Furthermore, the field profile is corrected for the tip broadening and thus allows a true size determination of isolated magnetic objects. Reconstructing the magnetization texture from the stray field landscape will need additional knowledge on the sample. Here, micromagnetic simulations can help by providing valid initial magnetization models.
I will report on our activities within a current European metrology project [4] to establish materials, measurement protocols and analysis procedures for a routine application of qMFM and will present various examples, which demonstrate the large benefit of treating MFM data quantitatively. These examples range from vortex states at nanowires and thin films to flux lines in superconductors and to optically written domains in magnetic data storage media [5].


[1] Hug et al. JAP 83 (1998), [2] Vock et al. APL 105 (2014), [3] Panchal et al. Sci. Rep. 7 (2017). [4] EMPIR 15SIB06 NanoMag [5] John et al., Sci. Rep. 7 (2017).

 

Last update: 18.01.2019 00:09.

venue 

Leibniz Institut für Festkörper- und Werkstoffforschung Dresden (D2E.27, Leibniz IFW Dresden) 
Helmholtzstraße 20
01069 Dresden
homepage
http://www.ifw-dresden.de 

organizer 

Leibniz Institut für Festkörper- und Werkstoffforschung Dresden (IFW)
Helmholtzstraße 20
01069 Dresden
homepage
http://www.ifw-dresden.de 
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