M-STAR: Magnetism second target advanced reflectometer at the Spallation Neutron Source

Author:

Lauter Valeria1ORCID,Wang Kang2ORCID,Mewes Tim3ORCID,Glavic Artur4ORCID,Toperverg Boris56ORCID,Ahmadi Mahshid7ORCID,Assaf Badih8ORCID,Hu Bin7ORCID,Li Mingda9ORCID,Liu Xinyu8ORCID,Liu Yaohua10ORCID,Moodera Jagadeesh9ORCID,Rokhinson Leonid11ORCID,Singh Deepak12ORCID,Sun Nian13ORCID

Affiliation:

1. Neutron Scattering Division, Neutron Sciences Directorate, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, Tennessee 37831, USA

2. Department of Electrical and Computer Engineering, Department of Physics, Department of Materials Science and Engineering, University of California, Los Angeles, California 90095, USA

3. Magnetics Laboratory, Department of Physics and Astronomy, The University of Alabama, 1008 Bevill Bldg., Tuscaloosa, Alabama 3548, USA

4. Laboratory for Neutron and Muon Instrumentation, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland

5. Department of Solid State Physics, Experimental Physics, Ruhr-University Bochum, Universitetsstrasse 150, Bochum D-44781, Germany

6. Institut Laue Langevin, 6 rue Jules Horowitz, Grenoble 38042, France

7. Department of Materials Science and Engineering, Institute for Advanced Materials and Manufacturing, University of Tennessee, 2641 Osprey Vista Way, Knoxville, Tennessee 37920, USA

8. 225 Nieuwland Science Center, University of Notre Dame, Notre Dame, Indiana 46556, USA

9. Massachusetts Institute of Technology, 77 Massachusetts Ave., Bldg. 24-209, Cambridge, Massachusetts 02139, USA

10. Second Target Station, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, Tennessee 37831, USA

11. Department of Physics, Purdue University, West Lafayette, Indiana 47906, USA

12. 223 Physics Building, Department of Physics and Astronomy, University of Missouri, Columbia, Missouri 65211, USA

13. Electrical and Computer Engineering Department, Northeastern University, 360 Huntington Avenue, Boston, Massachusetts 02115, USA

Abstract

M-STAR is a next generation polarized neutron reflectometer with advanced capabilities. A new focusing guide concept is optimized for samples with dimensions down to a millimeter range. A proposed hybrid pulse-skipping chopper will enable experiments at constant geometry at one incident angle in a broad range of wavevector transfer Q up to 0.3 A−1 for specular, off-specular, and GISANS measurements. M-STAR will empower nanoscience and spintronics studies routinely on small samples (∼2 × 2 mm2) and of atomic-scale thickness using versatile experimental conditions of magnetic and/or electric fields, light, and temperature applied in situ to novel complex device-like nanosystems with multiple buried interfaces. M-STAR will enable improved grazing incidence diffraction measurements, as a surface-sensitive depth-resolved probe of, e.g., the out-of-plane component of atomic magnetic moments in ferromagnetic, antiferromagnetic, and more complex structures as well as in-plane atomic-scale structures inaccessible with contemporary diffractometry and reflectometry. New horizons will be opened by the development of an option to probe near-surface dynamics with inelastic grazing incidence scattering in the time-of-flight mode. These novel options in combination with ideally matched parameters of the second target station will place M-STAR in the world’s leading position for high resolution polarized reflectometry.

Publisher

AIP Publishing

Subject

Instrumentation

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