micromagnetism nanomagnetism - engenwillem.engen.nl/uni/...micronanomagnetism_redist.pdf ·...
TRANSCRIPT
![Page 1: micromagnetism nanomagnetism - Engenwillem.engen.nl/uni/...micronanomagnetism_redist.pdf · “Micromagnetism and the Microstructure of Ferromagnetic solids”, Kronmüller and Fahnle,](https://reader036.vdocuments.site/reader036/viewer/2022071211/6023c1d9da854702f168358d/html5/thumbnails/1.jpg)
micromagnetismnanomagnetism
an
MMM mini-lectureby
Willem van Engenon
October 24, 2007
0 nm μm cm
![Page 3: micromagnetism nanomagnetism - Engenwillem.engen.nl/uni/...micronanomagnetism_redist.pdf · “Micromagnetism and the Microstructure of Ferromagnetic solids”, Kronmüller and Fahnle,](https://reader036.vdocuments.site/reader036/viewer/2022071211/6023c1d9da854702f168358d/html5/thumbnails/3.jpg)
0.06 T0.06 T 0.21 T0.21 T
![Page 4: micromagnetism nanomagnetism - Engenwillem.engen.nl/uni/...micronanomagnetism_redist.pdf · “Micromagnetism and the Microstructure of Ferromagnetic solids”, Kronmüller and Fahnle,](https://reader036.vdocuments.site/reader036/viewer/2022071211/6023c1d9da854702f168358d/html5/thumbnails/4.jpg)
θ
easy
axi
s
φ
H
![Page 5: micromagnetism nanomagnetism - Engenwillem.engen.nl/uni/...micronanomagnetism_redist.pdf · “Micromagnetism and the Microstructure of Ferromagnetic solids”, Kronmüller and Fahnle,](https://reader036.vdocuments.site/reader036/viewer/2022071211/6023c1d9da854702f168358d/html5/thumbnails/5.jpg)
θ
easy
ax
is
H H
anti-parallelφ = θ = π
φ
H
parallelφ = θ = 0
![Page 6: micromagnetism nanomagnetism - Engenwillem.engen.nl/uni/...micronanomagnetism_redist.pdf · “Micromagnetism and the Microstructure of Ferromagnetic solids”, Kronmüller and Fahnle,](https://reader036.vdocuments.site/reader036/viewer/2022071211/6023c1d9da854702f168358d/html5/thumbnails/6.jpg)
d2Ed2
=0 Hext=2K
0M sat
![Page 7: micromagnetism nanomagnetism - Engenwillem.engen.nl/uni/...micronanomagnetism_redist.pdf · “Micromagnetism and the Microstructure of Ferromagnetic solids”, Kronmüller and Fahnle,](https://reader036.vdocuments.site/reader036/viewer/2022071211/6023c1d9da854702f168358d/html5/thumbnails/7.jpg)
“Micromagnetism and the Microstructure of Ferromagnetic solids”, Kronmüller and Fahnle, 2003. ISBN 0521331358
![Page 8: micromagnetism nanomagnetism - Engenwillem.engen.nl/uni/...micronanomagnetism_redist.pdf · “Micromagnetism and the Microstructure of Ferromagnetic solids”, Kronmüller and Fahnle,](https://reader036.vdocuments.site/reader036/viewer/2022071211/6023c1d9da854702f168358d/html5/thumbnails/8.jpg)
superparamagnetism
Dth3=6kBT
Kln
m0
kBT
![Page 9: micromagnetism nanomagnetism - Engenwillem.engen.nl/uni/...micronanomagnetism_redist.pdf · “Micromagnetism and the Microstructure of Ferromagnetic solids”, Kronmüller and Fahnle,](https://reader036.vdocuments.site/reader036/viewer/2022071211/6023c1d9da854702f168358d/html5/thumbnails/9.jpg)
single vs. multi domain
Ddo=18
0M sat2
![Page 10: micromagnetism nanomagnetism - Engenwillem.engen.nl/uni/...micronanomagnetism_redist.pdf · “Micromagnetism and the Microstructure of Ferromagnetic solids”, Kronmüller and Fahnle,](https://reader036.vdocuments.site/reader036/viewer/2022071211/6023c1d9da854702f168358d/html5/thumbnails/10.jpg)
curling ...
“Micromagnetism”, Boardman, 2006. http://www.soton.ac.uk/~rpb/
![Page 11: micromagnetism nanomagnetism - Engenwillem.engen.nl/uni/...micronanomagnetism_redist.pdf · “Micromagnetism and the Microstructure of Ferromagnetic solids”, Kronmüller and Fahnle,](https://reader036.vdocuments.site/reader036/viewer/2022071211/6023c1d9da854702f168358d/html5/thumbnails/11.jpg)
... or buckling
“Development of elongated particle magnets”, Luborsky, 1961. doi:10.1063/1.2000392
![Page 12: micromagnetism nanomagnetism - Engenwillem.engen.nl/uni/...micronanomagnetism_redist.pdf · “Micromagnetism and the Microstructure of Ferromagnetic solids”, Kronmüller and Fahnle,](https://reader036.vdocuments.site/reader036/viewer/2022071211/6023c1d9da854702f168358d/html5/thumbnails/12.jpg)
Dth, D
nuc, D
doFe:
Co: Dth
Dnuc
Ddo
“Development of elongated particle magnets”, Luborsky, 1961. doi:10.1063/1.2000392
![Page 13: micromagnetism nanomagnetism - Engenwillem.engen.nl/uni/...micronanomagnetism_redist.pdf · “Micromagnetism and the Microstructure of Ferromagnetic solids”, Kronmüller and Fahnle,](https://reader036.vdocuments.site/reader036/viewer/2022071211/6023c1d9da854702f168358d/html5/thumbnails/13.jpg)
enough theory
applications!
![Page 14: micromagnetism nanomagnetism - Engenwillem.engen.nl/uni/...micronanomagnetism_redist.pdf · “Micromagnetism and the Microstructure of Ferromagnetic solids”, Kronmüller and Fahnle,](https://reader036.vdocuments.site/reader036/viewer/2022071211/6023c1d9da854702f168358d/html5/thumbnails/14.jpg)
microfluidics ...
“The origins and the future of microfluidics”, Whitesides, 2006. doi:10.1038/nature05058
![Page 16: micromagnetism nanomagnetism - Engenwillem.engen.nl/uni/...micronanomagnetism_redist.pdf · “Micromagnetism and the Microstructure of Ferromagnetic solids”, Kronmüller and Fahnle,](https://reader036.vdocuments.site/reader036/viewer/2022071211/6023c1d9da854702f168358d/html5/thumbnails/16.jpg)
microfluidics ...ferrofluidic pump
“Magnetism and microfluidics”, Pamme, 2006. doi:10.1039/b513005k
![Page 17: micromagnetism nanomagnetism - Engenwillem.engen.nl/uni/...micronanomagnetism_redist.pdf · “Micromagnetism and the Microstructure of Ferromagnetic solids”, Kronmüller and Fahnle,](https://reader036.vdocuments.site/reader036/viewer/2022071211/6023c1d9da854702f168358d/html5/thumbnails/17.jpg)
surfacecoating
biosensorsmagnetic bead
magnetite grains(Fe
3O
4)
polymer matrix
![Page 18: micromagnetism nanomagnetism - Engenwillem.engen.nl/uni/...micronanomagnetism_redist.pdf · “Micromagnetism and the Microstructure of Ferromagnetic solids”, Kronmüller and Fahnle,](https://reader036.vdocuments.site/reader036/viewer/2022071211/6023c1d9da854702f168358d/html5/thumbnails/18.jpg)
biosensorsbiochemical binding
Magnetic field sensorCurrent wire
Silicon chipSilicon chip
Agent Anti body
![Page 19: micromagnetism nanomagnetism - Engenwillem.engen.nl/uni/...micronanomagnetism_redist.pdf · “Micromagnetism and the Microstructure of Ferromagnetic solids”, Kronmüller and Fahnle,](https://reader036.vdocuments.site/reader036/viewer/2022071211/6023c1d9da854702f168358d/html5/thumbnails/19.jpg)
biosensorsbead attachment & measurement
Magnetic field sensorCurrent wire
Silicon chipSilicon chip
![Page 20: micromagnetism nanomagnetism - Engenwillem.engen.nl/uni/...micronanomagnetism_redist.pdf · “Micromagnetism and the Microstructure of Ferromagnetic solids”, Kronmüller and Fahnle,](https://reader036.vdocuments.site/reader036/viewer/2022071211/6023c1d9da854702f168358d/html5/thumbnails/20.jpg)
vortex switchingsimulations
“Current induced switching of vortex polarity in magnetic nanodisks”, Sheka et al., 2007. doi:10.1063/1.2775036
![Page 21: micromagnetism nanomagnetism - Engenwillem.engen.nl/uni/...micronanomagnetism_redist.pdf · “Micromagnetism and the Microstructure of Ferromagnetic solids”, Kronmüller and Fahnle,](https://reader036.vdocuments.site/reader036/viewer/2022071211/6023c1d9da854702f168358d/html5/thumbnails/21.jpg)
vortex switchingMFM measurements
“Electrical switching of the vortex core in a magnetic disk”, Yamada et al., 2007. doi:10.1038/nmat1867
![Page 22: micromagnetism nanomagnetism - Engenwillem.engen.nl/uni/...micronanomagnetism_redist.pdf · “Micromagnetism and the Microstructure of Ferromagnetic solids”, Kronmüller and Fahnle,](https://reader036.vdocuments.site/reader036/viewer/2022071211/6023c1d9da854702f168358d/html5/thumbnails/22.jpg)
- the end -