Magnetic Nanostructures; Confinement, Proximity and Induced Phenomena
https://dipc.ehu.eus/en/scientific-activities/joint-seminar-agenda/cic-nanogune/seminar232
https://dipc.ehu.eus/@@site-logo/dipc-logo.png
Magnetic Nanostructures; Confinement, Proximity and Induced Phenomena
CIC nanoGUNE Seminars
- Speaker
-
Ivan K. Schuller, Physics Department, UCSD, La Jolla, California, USA
- When
-
2011/11/29
13:00
- Place
- nanoGUNE seminar room, Tolosa Hiribidea 76, Donostia - San Sebastian
- Add to calendar
-
iCal
Subscribe to Newsletter

Magnetic nanostructures are receiving increasing attention in recent years,
motivated by the interesting phenomena when the physical size becomes
comparable to relevant magnetic length scales. In addition a number of
important potential applications in the sensors and storage industries have
emerged. When magnetic nanostructures are in contact (“proximityâ€) with
other dissimilar magnetic materials and because their magnetic fields extend
considerably outside the physical structure they are very susceptible to
interactions with the surrounding environment.
A particularly interesting situation is one in which a ferromagnetic
nanostructure is in contact with an antiferromagnetic substrate. In this
"exchange biased" proximity configuration, a variety of unusual phenomena
arise; the reversal mode of the ferromagnet changes considerably, the
superparamagnetic transition temperature is affected and there is a noticeable
change in the microscopic spin configuration. I will describe a series of
experiments in which we studied these phenomena in nanostructured ferromagnets
prepared by electron beam lithography and self-assembly. These experiments
include magnetotransport, magnetization, Magneto-Optic Kerr effect, neutron
and synchrotron scattering, and ultrafast pump probe. An attempt to arrive at
a universal understanding to many confusing issues in the field will be
presented.
Work supported by the US Department of Energy, US Air Force Office of
Scientific Research