Origin of the anomalous temperature dependence of coercivity in soft ferromagnets

Journal Article · Thu Aug 07 00:00:00 EDT 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4892038· OSTI ID:22314554

Moubah, R.; Ahlberg, M.; Zamani, A.; Olsson, A.; Hjörvarsson, B.; Jönsson, P. E. ^[1]; Shi, S.; Sun, Z. ^[2]; Carlson, S. ^[3]; Hallén, A. ^[4]

---

1. Department of Physics and Astronomy, Uppsala University, P.O. Box 516, SE-75120 Uppsala (Sweden)
2. Department of Physics, Chemistry and Biology, Linköping University, SE-58183 Linköping (Sweden)
3. MAX IV Laboratory, Lund University, SE-22100 Lund (Sweden)
4. KTH, School of Information and Communication Technology, Royal Institute of Technology, SE-16440 Kista-Stockholm (Sweden)

We report on the origin of the anomalous temperature dependence of coercivity observed in some soft ferromagnets by studying the magnetic and electronic properties of FeZr films doped using ion implantation by H, He, B, C, and N. The anomalous increase of the coercivity with temperature was observed only in the C- and B-doped samples. Using x-ray photoelectron spectroscopy, we show that the anomalous behavior of the coercivity coincides with the occurrence of an electron charge transfer for those implanted samples. The origin of the anomaly is discussed in terms of (i) magnetic softness, (ii) nature of the Fe-C and -B covalent bonds, and (iii) large charge transfer.

• OSTI ID: 22314554
• Journal Information: Journal of Applied Physics, Vol. 116, Issue 5; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CHEMICAL BONDS
COERCIVE FORCE
DOPED MATERIALS
ELECTRONS
FILMS
ION IMPLANTATION
ORIGIN
TEMPERATURE DEPENDENCE
X-RAY PHOTOELECTRON SPECTROSCOPY