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Thomas Mühl
t.muehl (et) ifw-dresden.de
Welcome to our
Magnetism on the nanoscale lecture!
Today:
Magnetic Microscopy
How to image/characterize nanomagnets or nanomagnetic configurations?
Question to you: Which magnetism-related interactions might be used to image magnetic properties?
(Please use public chat in BigBlueButton)
Interaction Microscopy method
Magnetic Force Microscopy (MFM)
Magnetic Force Microscopy
SEM
Source: Nielsch et al., JMMM 249, 234 (2002)
New types of MFM sensors
Source: Reiche, Mühl et al., New J.
Phys. 17, 013014 (2015)
MFM
Magneto-Optical Kerr Microscopy
Magneto-Optical Kerr Microscopy
Source: Hubert, Schäfer, Magnetic Domains, Springer 1998
before After contrast enhancement
Amorphous iron-nickel alloy
After quantitative evaluation(combining two digital images)
Photoemission Electron Microscopy (PEEM) with X-ray Magnetic Dichroism (XMCD)
Source: http://www.physik.fu-berlin.de/einrichtungen/ag/ag-
kuch/research/techniques/peem/index.html
Photoemission Electron Microscopy (PEEM) with X-ray Magnetic Dichroism (XMCD)
Source: Li et al., Nature Comm. (2014) DOI: 10.1038/ncomms5704
Source: http://www.physik.fu-berlin.de/einrichtungen/ag/ag-
kuch/research/techniques/peem/index.html
Co dot
XMCD Co PEEM
Photoemission Electron Microscopy (PEEM) with X-ray Magnetic Dichroism (XMCD)
Ni film
Lorentz Transmission Electron Microscopy
Source: Hubert, Schäfer, Magnetic Domains, Springer 1998
Lorentz Transmission Electron Microscopy
Question to the audience: Where do we expect Lorentz TEM contrast?
Source: Hubert, Schäfer, Magnetic Domains, Springer 1998
Lorentz Transmission Electron Microscopy
Source: Yu, Tokura et al., Nature 465, 901 (2010)
Magnetic skyrmions
Fe0.5Co0.5Si thin film (imaged by Lorentz TEM)
Further magnetic microscopy techniques:
Scanning probe based
• Magnetic resonance force microscopy
• Magnetic exchange force microscopy
• Spin-polarized scanning tunneling microscopy (SP-STM)
• Magnetic microscopy using nitrogen-vacancy probes
• Scanning Hall probe microscopy
Electron-beam based
• TEM-based electron holography
• Scanning electron microscopy with polarization analysis (SEMPA)
Thank you very much for your interest and also for all interactions during our online lecture.
In case of questions please do not hesitate to get in touch with me.
Best regardsThomas