Offentliggjort torsdag 04. marts 2010

Dato

torsdag 11. marts 2010

Tid

06.30 - 08.00

Sted

1520-732

Title: Towards a fundamental understanding of size effects in LSMO

Speaker: Ass. Prof. Erik Wahlström, Department of Physics,
Norwegian University of Science and technology (NTNU), Trondheim

Time: Wednesday, 10th March, 2010 at 15:15,

Place: Building 1520, room 732

Abstract:
This seminar intends to give an overview of the activities at NTNU to fine tune model systems and instrumentation towards studies of static and dynamic magnetic properties of nanostructured La0.7 Sr0.3 MnO3 (LSMO) films.

An introduction will be given to the fundamentals of LSMO thin film growth and nanostructuring, and our efforts to map out the basic properties at a nm scale. Three linked issues will be presented:

i) Pulsed Laser Deposition (PLD) based growth of thin film LSMO, and the structural and magnetic properties of few monolayer thin films, and pathways to prepare functional heterostructures of containing thin LSMO films.

ii) The possibility and technique to define 3D nanostructures in LSMO thin film surfaces through scanning tunnelling microscopy lithography under ambient conditions will be presented. The depth of the etched structures could be accurately controlled, increasing in a stepwise fashion with increasing bias voltage as well as with decreasing scan speed. This level of control enables complex 3D patterns to be routinely fabricated.

iii) Our work towards designing a STM for transport measurements will also be presented. An example will be presented in which we utilise STM to perform spatially resolved measurements of transport properties of nanostructured Cu/Co/Cu/Py films.

Philip Hofmann