Issue 21, 2024

Enhanced Curie temperature near 300 K in highly crystalline GdO epitaxial thin films concomitant with an anomalous Hall effect

Abstract

Gadolinium monoxide (GdO) is a recently discovered ferromagnetic semiconductor with a much higher Curie temperature of 276 K compared with that of europium monoxide (EuO), an archetypal oxide ferromagnetic semiconductor. Despite the requirement of epitaxial stabilization to synthesize metastable GdO with an unusual valence state, the lack of a lattice-matched substrate suppresses the electrical conductivity and the anomalous Hall effect. Here, ferromagnetic rare earth monoxide GdO (111) epitaxial thin films are successfully grown on CaF2 and yttria stabilized zirconia single crystal substrates by using a CaO (111) buffer layer. The buffer layer improves the crystallinity with a significantly reduced amount of Gd2O3 impurity phase, resulting in five-fold higher electron mobility compared to that of the GdO (001) epitaxial thin film without a buffer layer in the previous study. The improved electrical conduction enhances the ferromagnetic Curie temperature up to 303 K. In addition, the anomalous Hall effect is clearly observed. These results would enable the use of GdO in spintronic devices operated around room temperature.

Graphical abstract: Enhanced Curie temperature near 300 K in highly crystalline GdO epitaxial thin films concomitant with an anomalous Hall effect

Supplementary files

Article information

Article type
Paper
Submitted
24 Feb 2024
Accepted
15 Apr 2024
First published
10 May 2024

J. Mater. Chem. C, 2024,12, 7652-7657

Enhanced Curie temperature near 300 K in highly crystalline GdO epitaxial thin films concomitant with an anomalous Hall effect

T. Fukasawa, D. Kutsuzawa, D. Oka, K. Kaminaga, D. Saito, H. Shimizu, H. Naganuma and T. Fukumura, J. Mater. Chem. C, 2024, 12, 7652 DOI: 10.1039/D4TC00738G

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements