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

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Giant magnetoelectric effect in perpendicularly magnetized Pt/Co/Ta ultrathin films on a ferroelectric substrate
Materials Horizons ( IF 12.2 ) Pub Date : 2020-07-01 , DOI: 10.1039/d0mh00796j
Aitian Chen _{1,

2,

3,

4} , Haoliang Huang _{5,

6,

7,

8,

9} , Yan Wen _{1,

2,

3,

4} , Wenyi Liu _{5,

6,

7,

8,

9} , Senfu Zhang _{1,

2,

3,

4} , Jürgen Kosel _{2,

3,

4,

10,

11} , Weideng Sun _{9,

12,

13,

14} , Yonggang Zhao _{9,

12,

13,

14} , Yalin Lu _{5,

6,

7,

8,

9} , Xi-Xiang Zhang _{1,

2,

3,

4}

Affiliation

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.

中文翻译：

铁电衬底上垂直磁化的Pt / Co / Ta超薄膜中的巨磁电效应

垂直磁化层对于信息存储以增加存储密度至关重要。通过电场调制垂直磁化强度为降低能耗提供了有希望的解决方案。在这里，我们展示了铁电基板上垂直磁化的Pt / Co / Ta超薄膜中垂直磁化的显着电场调制。通过下测量反常霍耳效应原位电场，我们观察到与大相反的磁电系数的-2.1×10巨磁电效应^-6 SM ^-1在ħ _⊥ = -20奥斯特和-0.9×10 ^-6 SM ^{- 1}在ħ _⊥= 0 Oe，这与具有面内磁化的多铁异质结构相当。此外，克尔成像显示，电场可观察到影响Pt / Co / Ta超薄膜的磁畴结构，表明存在巨大的磁电效应。我们进一步测量了电场的原位X射线衍射和X射线反射率，这表明这种巨大的磁电效应归因于应变介导的磁电耦合，并且与电场可变的界面粗糙度密切相关。我们的发现突出了界面粗糙度在探索垂直磁化的电气控制中的作用。

更新日期：2020-09-01

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