1. Magnetic force resonance microscopy
Victor Mironov
Institute for physics of microstructures RAS, Nizhny Novgorod, Russia
“SPM 2017”, Yekaterinburg, August, 2017

2. Content Cantilever AFM oscillations Magnetic force microscopy (MFM)
Eddy current microscopy (ECM)
Magnetic resonance force microscopy (MRFM)
Conclusion

3. Atomic force microscopeFB Z
Photodetector
Laser 

4. Cantilever oscillationsm k
Piezo

5. Magnetic cantilever oscillations over the magnetic sample
Eddy current microscopy
ECM
Magnetic force microscopy
MFM
Magnetic resonance force microscopy
MRFM
Hybrid microscopy
ECM + MFM + MRFM

6. Magnetic force microscopy

7. Magnetic force microscope (MFM)FB Z
Photo detector
Laser 
Magnetic coating
Y. Martin, H. K. Wickramasinghe - Applied Physics Letters, 50, 1455 (1987).

8. Probe-sample magnetic interaction
Magnetic layer

9. Probe-sample magnetic interaction

10. Probe-sample magnetic interaction

11. Magnetic force microscopy MFM images of computer disc

12. MFM of single domain nanoparticles
600 × 400 × 20 nm

13. Array of single domain nanoparticles

14. MFM tip induced remagnetization

15. MFM tip induced remagnetization

16. Helicoidal state in three layer stackс b
(1)
(2)
(3) d
A.A. Fraerman, B.A. Gribkov et al. - J. Appl. Phys., 103, , (2008).

17. Spiral MFM contrast for three layer stack
(b)
Model MFM contrast
Experimental MFM image
A.A.Fraerman, B.A.Gribkov et al. - J. Appl. Phys., 103, , (2008).

18. Eddy current microscopy

19. Eddy currents

20. Cantilever oscillations
Insulator
Copper
V. Nalladega et al., Rev. Sci. Instr., 79, (2008)

21. Eddy current microscopy of local conductivity
ECM image 5×5 m
AFM image 5×5 m
B. Hoffmann et al., Appl. Phys. A, 66, S409 (1998)

22. ECM spatial resolution
AFM
ECM
V. Nalladega et al., Rev. Sci. Instr., 79, (2008)

23. Magnetic resonance force microscopy

24. Magnetic resonance force microscopy
Traditional MR Imaging
Detector
Inductor
resonant slice
0.1 мм
Hrf Н H Δ+
MRFM
Magnetic resonance force microscopy (MRFM) is a new microscopic imaging technique that combines aspects of atomic force microscopy (AFM) with magnetic resonance imaging (MRI). Its challenging possibilities are: true three-dimensional, sub-surface imaging with potential atomic resolution and chemical specificity.
MRFM signals arise when spins in a sample are modulated by an applied radio-frequency field, precisely as in conventional magnetic resonance imaging. Only spins within a thin resonant slice are affected; the spins below are in too strong a field for resonance, while spins above are in too weak a field.
The ultra-high force sensitivity of the resonator demonstrated in the AFM enables much higher sensitivity to spin magnetization in MRFM and thus much higher spatial resolution than is achievable in conventional MRI.
Detector
Inductor
Hrf
0.1 µm H Δ+
John A. Sidles, University of Washington, School of Medicine,
Department of Orthopedics
J. A. Sidles, Appl. Phys. Lett. 58, 2854 (1991) 24

25. Ferromagnetic resonance

26. Principles of FMR MRFM h
ωmod = ωres t
ωFMR= 1 GHz
ω res= 50 GHz

27. Principles of FMR MRFM
MW Generator
Control
system
Modulator
Magnet

28. MRFM sample pumping ~ ~ Vrf Hrf S G (а) Vrf (b) (b) Hrf (c) (c) G S

29. MRFM of Permalloy nanodisc
(а)
(b)
(c)
(d)
(e)
(f)
F.Guo, et al., Phys. Rev. Lett., 110, (2013).

30. MRFM of single domain wall in curved nanowire
(b)
(c)
(e)
(f)
(d)

31. Conclusion
We considered the different methods of sample investigation with magnetic SPM probe based on mechanical resonance of cantilever.
Magnetic force microscopy (MFM).
Eddy current microscopy (ECM).
Magnetic resonance force microscopy (MRFM).
All these modes and their combinations can be used for complex characterization of magnetic nanostructures.

32. Acknowledgements
Project of Russian Science Foundation   RSF №
«Magnetic resonance force microscopy of ferromagnetic nanostructures»
Official web site:

33. Thanks for your attention !