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- Title
Local Lattice Distortion Effect on the Magnetic Ordering of the Heusler Alloy CoFeAlSi Film.
- Authors
Zhai, Min; Ye, Shuangli; Xia, Zhengcai; Liu, Feng; Qi, Chang; Shi, Xinzhi; Wang, Gaofeng
- Abstract
A series of Heusler alloy CoFeAlSi (CFAS) thin film on MgO(100) substrate has been fabricated by magnetron sputtering with in situ annealing process at a temperature of 350, 450, 550, and 650 °C, respectively. X-ray diffraction (XRD), temperature-dependent Raman, and superconducting quantum interference device (SQUID) measurements have been performed to clarify the interplay between the structure and magnetic properties of the CFAS films. The XRD results reveal that both the crystallization and chemical ordering of the CFAS films are enhanced by the increasing annealing temperature. From the Raman spectroscopy, the representative Raman-active modes associated with L2 phase can be observed. The Raman mode at 843 cm shows a strong temperature-dependent behavior, which has an obvious increase in intensity with the increasing of the annealing temperature as well. On the other hand, the increasing saturation magnetization and decreasing coercivity of the CFAS films with the increasing annealing temperature can be found by using the SQUID measurements. These structural and magnetic results of the CFAS films demonstrate that the crystallization and chemical ordering take the dominating role in the magnetic property. However, the variation of the Raman mode suggests that the local lattice distortion associated with the L2 phase cannot be considered as the origin of the magnetic disordering.
- Subjects
LATTICE theory; HEUSLER alloys; THIN films; MAGNETISM; CRYSTALLIZATION; ORDER-disorder in alloys
- Publication
Journal of Superconductivity & Novel Magnetism, 2014, Vol 27, Issue 8, p1861
- ISSN
1557-1939
- Publication type
Article
- DOI
10.1007/s10948-014-2526-z