Large tunable FMR frequency shift by magnetoelectric coupling in oblique-sputtered Fe
 52.5
 Co
 22.5
 B
 25.0
 /PZN-PT multiferroic heterostructure

The voltage control of magnetism has attracted intensive attention owing to the abundant physical phenomena associated with magnetoelectric coupling. More importantly, the techniques to electrically manipulate spin dynamics, such as magnetic anisotropy and ferromagnetic resonance, are of great significance because of their potential applications in high-density memory devices, microwave signal processors, and magnetic sensors. Recently, voltage control of spin waves has also been demonstrated in several multiferroic heterostructures. This development provides new platforms for energyefficient, tunable magnonic devices. In this review, we focus on the most recent advances in voltage control of ferromagnetic resonance and spin waves in magnetoelectric materials and discuss the physical mechanisms and prospects for practical device applications.

Section: Voltage Control Of Fmr Via Strain/stressmentioning

confidence: 99%

Voltage control of ferromagnetic resonance and spin waves

Zhao

et al. 2018

“…The magnetoelectric-coupling is an effective way to adjust the FMR frequency by electric field instead of the change of anisotropy field. [21] However, the external electric field also restricts the using of the magnetoelectric-coupling in many applications. In our previous work, [22] we proposed a rotatable anisotropy system with combined uniaxial anisotropy and rotatable stripe domain, whose easy magnetization direction can be controlled by applying a sufficiently large magnetic field along an arbitrary direction, [23][24][25] to realize the angular control of the f uni .…”

Section: Introductionmentioning

confidence: 99%

Angular control of multi-mode resonance frequencies in obliquely deposited CoZr thin films with rotatable stripe domains*

Li¹,

Jiang²,

Chai³

2021

We investigate the angular-dependent multi-mode resonance frequencies in CoZr magnetic thin films with a rotatable stripe domain structure. A variable range of multi-mode resonance frequencies from 1.86 GHz to 4.80 GHz is achieved by pre-magnetizing the CoZr films along different azimuth directions, which can be ascribed to the competition between the uniaxial anisotropy caused by the oblique deposition and the rotatable anisotropy induced by the rotatable stripe domain. Furthermore, the regulating range of resonance frequency for the CoZr film can be adjusted by changing the oblique deposition angle. Our results might be beneficial for the applications of magnetic thin films in microwave devices.

“…where γ, H K , and 4πM S refer to the gyromagnetic ratio, magnetic anisotropy field, and saturation magnetization of the SMFs, respectively. There are many approaches to improve the zero-field FMR frequency, such as oblique sputtering, [4,10] composition gradient sputtering (CGS), [11] magnetoelectric coupling, [5,12] exchange coupling, [13][14][15] interlayer exchange coupled optical mode resonance, [16,17] in-serting a underlayer, [18][19][20][21] etc. Among them, the oblique deposition technique is a simple and easily controllable method to tailor the magnetic anisotropies in magnetic films.…”

Section: Introductionmentioning

confidence: 99%

Improvement of high-frequency properties of Co₂FeSi Heusler films by ultrathin Ru underlayer*

Wang

Zhang

et al. 2020

Heusler Co2FeSi films with a uniaxial magnetic anisotropy and high ferromagnetic resonance frequency f r were deposited by an oblique sputtering technique on Ru underlayers with various thicknesses t Ru from 0 nm to 5 nm. It is revealed that the Ru underlayers reduce the grain size of Co2FeSi, dramatically enhance the magnetic anisotropy field H K induced by the internal stress from 242 Oe (1 Oe = 79.5775 A⋅m−1) to 582 Oe with an increment ratio of 2.4, while a low damping coefficient remains. The result of damping implies that the continuous interface between Ru and Co2FeSi induces a large in-plane anisotropic field without introducing additional external damping. As a result, excellent high-frequency soft magnetic properties with f r up to 6.69 GHz are achieved.