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Journal of Applied Physics / Volume 109 / Issue 7 / PROCEEDINGS OF THE 55TH ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS / Ultra-thin and Multi-layer Films

J. Appl. Phys. 109, 07C111 (2011); http://dx.doi.org/10.1063/1.3556958 (3 pages)

Spin-polarized metastable He study of surface magnetic order in Ho thin films

A. Pratt1,2, M. Kurahashi1, and Y. Yamauchi1

1National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Japan
2York Institute for Materials Research, University of York, York YO10 5DD, United Kingdom

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(Received 24 September 2010; accepted 30 November 2010; published online 28 March 2011)

A spin-polarized metastable helium beam operating in magnetic fields of up to 5 T has been used to investigate the spin polarization at the surface of thin films of Ho(0001) grown on W(110) substrates. The extreme surface sensitivity of this technique allows a direct probe of the various magnetic structures that form as a function of film thickness, temperature, and applied magnetic field. Evidence for a transition from a conical ferromagnetic structure to a helical antiferromagnetic (AFM) phase is observed at low temperatures with a further transition to paramagnetism at close to the AFM ordering temperature, TN. In addition, the spin polarization of the 6s CE that mediate the exchange interaction between localized Ho 4f moments (the RKKY interaction) is found to be positive, supporting earlier observations.

© 2011 American Institute of Physics

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KEYWORDS and PACS

Keywords

electron spin polarisation, holmium, magnetic structure, magnetic thin films, paramagnetic-antiferromagnetic transitions, RKKY interaction

PACS

  • 75.70.Ak

    Magnetic properties of monolayers and thin films

  • 75.30.Kz

    Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)

  • 75.25.-j

    Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)

  • 75.20.Hr

    Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions

  • 75.30.Et

    Exchange and superexchange interactions

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3556958

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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