Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 17: Poster Session I

MA 17.1: Poster

Dienstag, 8. März 2016, 09:30–12:30, Poster B1

How to accomplish (quasi) in-situ neutron reflectivity measurements on ultrathin magnetic films — •Sabine Pütter, Amir Syed Mohd, Stefan Mattauch, Alexandros Koutsioubas, Harald Schneider, and Thomas Brückel — Jülich Centre for Neutron Science JCNS, Forschungszentrum Jülich GmbH, Outstation at MLZ, Garching, Germany

The investigation of ultrathin films which are sensitive to ambient air at large scale instruments is a challenge as the capabilities for on-site growth UHV chambers to measure in-situ are often limited, mostly due to lacking space. A common solution is the use of protecting cap layers on top of the films. However they might change the physical properties of the sample.

Our solution is a handy mini UHV-chamber which is used for sample transfer and quasi in-situ measurements at the neutron reflectivity instrument MARIA of the Jülich Centre for Neutron Science at MLZ in Garching. The samples are prepared in the adjacent thin film laboratory by molecular beam epitaxy and moved into the compact chamber for transfer. It is equipped with sapphire windows, an SAES getter pump and a wobble stick, which serves also as a sample holder for samples of up to 1.4 cm². The pressure in the transfer chamber is kept below 10⁻⁹ mbar. Neutron reflectivity measurements can be performed at room temperature in magnetic fields of up to 600 mT.

We present first polarized neutron reflectivity measurements on Co thin films at room temperature in a magnetic field of 300 mT in the Q-range up to 0.2 Å⁻¹.