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Issue 9, 2020
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Giant magnetoelectric effect in perpendicularly magnetized Pt/Co/Ta ultrathin films on a ferroelectric substrate

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Abstract

Perpendicularly magnetized layers are essential for information storage to increase the storage density. Modulating perpendicular magnetization by an electric field offers a promising solution to lower energy consumption. Here, we demonstrate a remarkable electric field modulation of perpendicular magnetization in perpendicularly magnetized Pt/Co/Ta ultrathin films on a ferroelectric substrate. By measuring the anomalous Hall effect under in situ electric fields, we observe a giant magnetoelectric effect with the large converse magnetoelectric coefficient of −2.1 × 10−6 s m−1 at H = −20 Oe and −0.9 × 10−6 s m−1 at H = 0 Oe, which is comparable to that in multiferroic heterostructures with in-plane magnetization. Additionally, Kerr imaging shows that electric fields observably affect magnetic domain structures of the Pt/Co/Ta ultrathin films indicating a giant magnetoelectric effect. We further measure in situ X-ray diffraction and X-ray reflectivity with electric fields, which suggests that this giant magnetoelectric effect is attributed to strain-mediated magnetoelectric coupling and is closely related to electric-field-varied interface roughness. Our findings highlight the role of interface roughness in exploring electrical control of perpendicular magnetization.

Graphical abstract: Giant magnetoelectric effect in perpendicularly magnetized Pt/Co/Ta ultrathin films on a ferroelectric substrate

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Supplementary files

Article information


Submitted
13 May 2020
Accepted
01 Jul 2020
First published
01 Jul 2020

This article is Open Access

Mater. Horiz., 2020,7, 2328-2335
Article type
Communication

Giant magnetoelectric effect in perpendicularly magnetized Pt/Co/Ta ultrathin films on a ferroelectric substrate

A. Chen, H. Huang, Y. Wen, W. Liu, S. Zhang, J. Kosel, W. Sun, Y. Zhao, Y. Lu and X. Zhang, Mater. Horiz., 2020, 7, 2328
DOI: 10.1039/D0MH00796J

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