The DOI matches its Crossref record; 3 of the 3 references it cites were found in a registry or an index.
On the relationship of high coercivity and L1 ordered phase in CoPt and FePt thin films
Abstract
The microstructure and the room-temperature hysteretic magnetic properties of sputtered, 10 nm thin films of equiatomic binary alloys of CoPt and FePt were characterized using transmission electron microscopy (TEM) and a superconducting quantum interference device (SQUID) magnetometer. A transformation from an atomically disordered, face-centered-cubic structure to the L10 ordered structure occurred during postdeposition annealing and was characterized using digital analysis of dark-field TEM images. The transformation was observed to follow first-order nucleation and growth kinetics, and the ordered volume fraction transformed was quantified at numerous points during the transformation. The ordered volume fraction was then compared to the magnetic coercivity data obtained from the SQUID magnetometer. In contrast to the relationship most commonly described in the literature, that the highest coercivity corresponds to a two phase ordered/disordered mixture, the maximum value for coercivity in this study was found to correspond to the fully ordered state. Furthermore, in samples that were less than fully ordered, a direct relationship between ordered volume fraction and coercivity was observed for both CoPt and FePt. The proposed mechanism for the high coercivity in these films is an increasing density of magnetic domain wall pinning sites concurrent with an increasing fraction of ordered phase.
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Citations
Cites
Introduction to magnetic materials
(2009) · Materials Today · doi:10.1016/s1369-7021(09)70091-4 · Cited by 5,615
High anisotropy L1/sub 0/ thin films for longitudinal recording
Coffey, K. R., Parker, M. A., & Howard, J. K. (1995) · IEEE Transactions on Magnetics · doi:10.1109/20.490108 · Cited by 285
Self-citationOn the High-Energy Product Fe–Pt Permanent Magnet Alloys
Watanabe, K., & Masumoto, H. (1983) · Transactions of the Japan Institute of Metals · doi:10.2320/matertrans1960.24.627 · Cited by 89
Cited by
Monodisperse FePt Nanoparticles and Ferromagnetic FePt Nanocrystal Superlattices
Sun, S., Murray, C. B., Weller, D., Folks, L., & Moser, A. (2000) · Science · doi:10.1126/science.287.5460.1989 · Cited by 6,137
Hard-Magnet L10-CoPt Nanoparticles Advance Fuel Cell Catalysis
Li, J., Sharma, S., Liu, X., Pan, Y.-T., Spendelow, J. S., Chi, M., Jia, Y., Zhang, P., Cullen, D. A., Xi, Z., et al. (2019) · Joule · doi:10.1016/j.joule.2018.09.016 · Cited by 532
Deciphering chemical order/disorder and material properties at the single-atom level
Yang, Y., Chen, C.-C., Scott, M. C., Ophus, C., Xu, R., Pryor, A., Wu, L., Sun, F., Theis, W., Zhou, J., et al. (2017) · Nature · doi:10.1038/nature21042 · Cited by 357
Competition between ferromagnetism and antiferromagnetism in FePt
Brown, G., Kraczek, B., Janotti, A., Schulthess, T. C., Stocks, G. M., & Johnson, D. D. (2003) · Physical Review B · doi:10.1103/physrevb.68.052405 · Cited by 86
Metadata
- Authors
- Ristau, R. A., Barmak, K., Lewis, L. H., Coffey, K. R., & Howard, J. K.
- Venue
- Journal of Applied Physics
- Publisher
- AIP Publishing
- Published
- 1999-10-15
- Volume
- 86
- Issue
- 8
- Pages
- 4527-4533
- ISSN
- 0021-8979 (ISSN-L)
- 1089-7550
- OpenAlex
- W2049106317
- Cited by
- 342
- References
- 3
- FWCI
- 7.41
- Type
- journal article
- Language
- en
- Open access
- closed
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- Ristau, R. A., Barmak, K., Lewis, L. H., Coffey, K. R., & Howard, J. K. (1999). On the relationship of high coercivity and L1 ordered phase in CoPt and FePt thin films. Journal of Applied Physics. https://doi.org/10.1063/1.371397
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