Dresden 2014 – scientific programme

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VA: Fachverband Vakuumphysik und Vakuumtechnik

VA 3: Vacuum based Manufacturing, Coating and Analysis

VA 3.1: Talk

Monday, March 31, 2014, 15:40–16:00, HSZ 105

A 4K-UHV-Cryostat-System for Magnetic Exchange Force Microscopy with a 2-Axes-Vector-Field Magnet — •Lasse Cornils, René Schmidt, Alexander Schwarz, and Roland Wiesendanger — Institute of Applied Physics, University of Hamburg, Jungiusstrasse 11, 20355 Hamburg, Germany

Magnetic exchange force microscopy (MExFM) is utilized to study magnetic ordering with atomic resolution and single spin sensitivity in real space [1]. Being able to apply a rotatable magnetic field allows to study magnetic anisotropy effects of complex spin structures or single magnetic atoms on surfaces. Therefore an existing ultra high vacuum (UHV) cryostat [2] was equipped with a 2-axes vector field magnet allowing to apply 6T out-of-plane (z-direction) and 2T in-plane (x-direction). Up to 2T can be applied in any direction in the xz-plane. The performance of the microscope is demonstrated by atomic resolution measurements on NaCl(100).
Moreover, new features to prepare clean samples were added to the original UHV-system, e.g. a new electron beam heating stage for controlled sample temperatures between room temperature and 1800 ^∘C.

[1] U. Kaiser, et al., Nature 446, 522-525 (2007).

[2] W. Allers, et al., Rev. Sci. Instrum. 69, 221-225 (1998).