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The role of low Gd concentrations on magnetisation behaviour in rare earth:transition metal alloy films

Inyang, O.; Rafiq, A.; Swindells, C.; Ali, S.; Atkinson, D.

The role of low Gd concentrations on magnetisation behaviour in rare earth:transition metal alloy films Thumbnail


Authors

A. Rafiq

C. Swindells

S. Ali



Abstract

The magnetisation reversal behaviour as a function of composition was studied in low rare earth concentration alloys. 30 nm thick rare earth:transition-metal films of composition GdxCo100−x, GdxFe100−x and Gdx(Co50Fe50)100−x were prepared by magnetron sputtering, where x ranged from 4 to 13 atomic%. Magnetisation behaviour was studied using MOKE and Hall hysteresis measurements. The magnetic reversal behaviour as a function of Gd content is strongly dependent on the transition metal. With increasing Gd content the film structure transitions from crystalline to amorphous and the saturation magnetisation decreases linearly. For GdCo, the reversal field, Hc, increases by less than a factor of two with Gd doping of 11%, while for Fe, the coercivity falls by a factor of ten with 8% Gd. This may be attributed to changes in the crystalline morphology. GdCoFe shows a similar trend with Gd doping for the in-plane reversal field to that of GdFe. With 13% Gd in Fe there is evidence indicating the presence of a weak perpendicular magnetic anisotropy, PMA. With Gd doping the anomalous Hall resistivity of Co, Fe and CoFe increases significantly with the largest increase observed for GdCoFe.

Citation

Inyang, O., Rafiq, A., Swindells, C., Ali, S., & Atkinson, D. (2020). The role of low Gd concentrations on magnetisation behaviour in rare earth:transition metal alloy films. Scientific Reports, 10(1), Article 9767. https://doi.org/10.1038/s41598-020-66595-5

Journal Article Type Article
Acceptance Date May 26, 2020
Online Publication Date Jun 17, 2020
Publication Date 2020
Deposit Date Jun 25, 2020
Publicly Available Date Jun 25, 2020
Journal Scientific Reports
Publisher Nature Research
Peer Reviewed Peer Reviewed
Volume 10
Issue 1
Article Number 9767
DOI https://doi.org/10.1038/s41598-020-66595-5

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