Interplay between structure and magnetism in Fe/Cu(1 0 0) upon temperature variation
Interleaved low-energy electron diffraction (LEED) and magneto-optical Kerr effect (MOKE) measurements were carried out for room-temperature epitaxially grown FCC-like Fe/Cu(1 0 0) in the temperature range of 120-400 K. The structure of the Fe film was found to be not only dependent on thickness, as...
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| Main Authors: | , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
1 October 1997
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| In: |
Journal of magnetism and magnetic materials
Year: 1997, Volume: 174, Issue: 1-2, Pages: 40-56 |
| ISSN: | 1873-4766 |
| DOI: | 10.1016/S0304-8853(97)00220-5 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/S0304-8853(97)00220-5 Verlag, lizenzpflichtig, Volltext: https://www.sciencedirect.com/science/article/pii/S0304885397002205 
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| Author Notes: | M. Zharnikov, A. Dittschar, W. Kuch, C.M. Schneider, J. Kirschner |
| Summary: | Interleaved low-energy electron diffraction (LEED) and magneto-optical Kerr effect (MOKE) measurements were carried out for room-temperature epitaxially grown FCC-like Fe/Cu(1 0 0) in the temperature range of 120-400 K. The structure of the Fe film was found to be not only dependent on thickness, as was believed previously, but also to be influenced by the temperature. Temperature-driven structural transitions were observed in the 4 and 4.5 ML films, this effect being more pronounced at 4 ML thickness. Whereas the whole 4 ML film assumes an FCC-like structure with a strong tetragonal expansion (FCT-like) at temperatures below 313 K, the bulk of the film relaxes into the ‘isotropic’ FCC-like structure and only the top layers remain expanded at temperatures above 333 K. Because only the FCT-like (expanded) Fe possesses ferromagnetic properties, the film becomes paramagnetic after heating above 333 K. This finding represents a new type of magnetic order-disorder transition and explains the lower value of the Curie temperature in the 4 ML Fe film as compared to 3 ML. In the 4.5 ML Fe film the similar correlation between the temperature-driven structural transition and an occurrence of the ferromagnetic long-range order was observed. Additionally, a pronounced difference in the energy positions of the characteristic maxima in the LEED I(E) curves for the (0 0) beam as well as a kinematic analysis of these curves imply a difference in the value of the tetragonal expansion for the entirely expanded FCC-like Fe film and the film expanded only in the topmost layers. |
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| Item Description: | Available online 19 May 1998 Gesehen am 06.02.2023 |
| Physical Description: | Online Resource |
| ISSN: | 1873-4766 |
| DOI: | 10.1016/S0304-8853(97)00220-5 |