Skip to main content
×
×
Home

Onset of Exchange Anisotropy in Epitaxial fct-Cobalt(001)/fct-Manganese(001) Bilayers

  • Jürgen T. Kohlhepp (a1), Harm Wieldraaijer (a2) and Wim J. M. de Jonge (a3)
Abstract
ABSTRACT

Manganese (Mn) grows in a meta-stable expanded (c/a > 1) face-centered-tetragonal (fct) phase on thin fct-Co(001) template films. For small Mn thicknesses a close to a layer-by-layer growth is observed. Antiferromagnetism (AFM) of fct-Mn is evidenced by the observation of shifted magnetization loops antiparallel to the cooling field direction (negative bias) and enhanced coercive fields for Co/Mn bilayers. At low temperatures magnetic Co/Mn interface exchange interactions are detected for nominal Mn thicknesses as low as 1.3 monolayer (ML), indicating the onset of AFM in 2 ML thick Mn islands. However, between 2 ML and 5 ML Mn a positive bias of the magnetization loops is observed in a certain temperature range below the blocking temperature (TB) of the films. This peculiar behavior is explained by the dependence of TB on both the local Mn ML thickness and the Mn island size, leading to a unidirectional coercivity enhancement in a temperature range where both blocked and unblocked regions are coexisting in the Mn layers.

Copyright
References
Hide All
1 Nogués J. and Schuller I. K., J. Magn. Magn. Mater. 192 203 (1999).
2 Berkowitz A. E. and Takano K., J. Magn. Magn. Mater. 200 552 (1999).
3 Nogués J., Sort J., Langlais V., Skumryev V., Surinach S., Munoz J. S., and Baró M. D., Physics Reports 422 65 (2005).
4 Hafner J. and Spiŝàk D., Phys. Rev. B. 72 144420 (2005).
5 Kohlhepp J. T. and Jonge W. J. M. de, submitted for publication.
6 Schmid A. K and Kirschner J., Ultramicroscopy 42 483 (1992).
7 Wieldraaijer H., Jonge W. J. M. de, and Kohlhepp J. T., Phys. Rev. Lett. 93 177205 (2004).
8 Wieldraaijer H., Jonge W. J. M. de, and Kohlhepp J. T., Phys. Rev. B. 72 155409 (2005).
9 O'Brien W. L. and Tonner B. P., Phys. Rev. B. 50 2963 (1994).
10 Leighton C., Nogués J., Jönsson-Åkerman B. J., and Schuller I. K., Phys. Rev. Lett. 84 3466 (2000).
11 Gredig T., Krivorotov I. N., Eames P., and Dahlberg E. D., Appl. Phys. Lett. 81, 1270 (2002).
Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

MRS Online Proceedings Library (OPL)
  • ISSN: -
  • EISSN: 1946-4274
  • URL: /core/journals/mrs-online-proceedings-library-archive
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×

Keywords:

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 1 *
Loading metrics...

Abstract views

Total abstract views: 40 *
Loading metrics...

* Views captured on Cambridge Core between September 2016 - 18th January 2018. This data will be updated every 24 hours.