Electrically induced enormous magnetic anisotropy in Terfenol-D/lead zinc niobate-lead titanate multiferroic heterostructures

Abstract

Electric field (E-field) tunable multiferroic devices such as tunable RF devices and memory storage mediums require strong magnetoelectric interactions. In this paper, we demonstrated a Terfenol-D/lead zinc niobate-lead titanate composite bilayer structure with an E-field-induced magnetic anisotropy field of 3500 Oe and a magnetoelectric coefficient of 580 Oe cm/kV. This is the largest E-field induced anisotropy reported to date, resulting in a strong dependence of magnetization process and tunable ferromagnetic resonance in both amorphous and crystalline Terfenol-D films. In addition, the magnetostriction constants of crystalline and amorphous Terfenol-D were estimated to be 420 ppm and 320 ppm, respectively, which are close to report values. Electrically manipulating magnetic performance holds great potential for future ultra-low power, lightweight, tunable magnetic devices, and memory storage.

Electrically controlled non-volatile switching of magnetism in multiferroic heterostructures via engineered ferroelastic domain states

“…Upon removing the voltage, the magnetic state returns to the initial state. 30,[42][43][44][45] This has been demonstrated in many prototype ME systems, such as Y 3 46 Ni/PMN-PT, 47 Fe 3 O 4 /PZN-PT(011), 19 La 0.7 Sr 0.3 CoO 3 /PMN-PT(011) 48 and La 0.7 Ca 0. 15 Mn 0.15 O 3 /PMN-PT(001).…”

Sputter deposited Terfenol-D thin films for multiferroic applications

“…al. 9 When the PMN-PT sample is poled, i.e., out of plane [011] direction, it generates a large tensile strain along in-plane [01-1] direction, ε y , and a compressive strain along [100] direction, ε x . 18 The large anisotropic strain coupled to the positive magnetoelastic Terfenol-D film produces a large in-plane magnetic anisotropy.…”

“…observed giant magnetic anisotropy field change of 3500 Oe in polycrystalline Terfenol-D thin film deposited on single crystal (011) cut PZN-PT with a 0.6 MV/m E-field. 9 The differences in these two data sets are directly related to the quality of Terfenol-D thin films used and this represents a significant issue to the strain mediated multiferroic community. Several fabrication and characterization studies on thin film Terfenol-D have been conducted during the last two decades.…”

Voltage control of ferromagnetic resonance

“…[32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48] The E-field was applied across substrate and the magnetic field was applied along the in-plane (IP) direction, vertical to the microwave propagation. As an E-field is applied, the piezoelectric substrate undergoes a tensile or compressive deformation and that strain can be coherently transferred to magnetic films resulting in an effective magnetic field H eff through the magnetoelastic effect.…”

“…Lots of layered strain/stress dominated multiferroic heterostructures such as bulk/bulk, [27][28][29][30][31] thin film/bulk [32][33][34][35][36][37][38][39][40][41][42][43][44][45] and thin film/thin film 47 magnetic/ferroelectric or magnetic/piezoelectric heterostructures were demonstrated in this paper. By applying voltage across the ferroelectric/piezoelectric layer, the ferroelectric/piezoelectric layer generates a large strain/stress energy change that influence the magnetic layer, therefore, change the effective magnetic anisotropy energy which lead to an effective FMR field or frequency change.…”