Dual-mode ferromagnetic resonance in an FeCoB/Ru/FeCoB synthetic antiferromagnet with uniaxial anisotropy

Wang, Cuiling; Zhang, Shouheng; Qiao, Shan; Du, Hong; Liu, Xiaomin; Sun, Ruicong; Chu, Xiangcheng; Miao, Guo‐Xing; Dai, Yatang; Kang, Shishou; Shen, Yan; Li, Shandong

doi:10.1063/1.5018809

Cited by 16 publications

(8 citation statements)

References 33 publications

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“…An acoustic mode is not seen in the AF configuration due to these vectors resonating in phase but in opposite direction canceling out any measurable response (essentially phase locked) [21,48]. The experimental data show that the optic mode endures to much higher fields than has been reported previously, vanishing at an applied field of approximately 1400 Oe in the case of SAF2 as opposed to the approximately 300 Oe field value seen in other literature reports [49].…”

Section: Dynamic Magnetic Propertiescontrasting

confidence: 42%

Zero-field Optic Mode Beyond 20 GHz in a Synthetic Antiferromagnet

et al. 2020

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Antiferromagnets have considerable potential as spintronic materials. Their dynamic properties include resonant modes at frequencies higher than can be observed in conventional ferromagnetic materials. An alternative to single-phase antiferromagnets are synthetic antiferromagnets (SAFs), engineered structures of exchange-coupled ferromagnet/nonmagnet/ferromagnet trilayers. SAFs have significant advantages due to the wide-ranging tunability of their magnetic properties and inherent compatibility with current device technologies, such as those used for Spin-transfer-torque magnetic random-access memory production. Here we report the dynamic properties of fully compensated SAFs using broadband ferromagnetic resonance and demonstrate resonant optic modes in addition to the conventional acoustic (Kittel) mode. These optic modes possess the highest zero-field frequencies observed in SAFs to date with resonances of 18 and 21 GHz at the first and second peaks in antiferromagnetic Ruderman-Kittel-Kasuya-Yosida (RKKY) coupling, respectively. In contrast to previous SAF reports that focus only on the first RKKY antiferromagnetic coupling peak, we show that a higher optic mode frequency is obtained for the second antiferromagnetic coupling peak. We ascribe this to the smoother interfaces associated with a thicker nonmagnetic layer. This demonstrates the importance of interface quality to achieving high-frequency optic mode dynamics entering the subterahertz range.

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Section: Dynamic Magnetic Propertiescontrasting

confidence: 42%

Zero-field Optic Mode Beyond 20 GHz in a Synthetic Antiferromagnet

et al. 2020

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“…These contradicting requirements seriously restrict the application of IEC films as microwave soft magnetic materials. Very recently, potential applications of OM resonance in microwave components have been successfully demonstrated by several groups. ,,,, In our previous work, a pure OM resonance with ultrahigh f r O of 11.62 GHz was obtained in AF-coupled FeCoB 25nm /Ru t /FeCoB 25nm sandwiched films. ,, …”

Section: Introductionmentioning

confidence: 92%

Ultrahigh Frequency and Anti-Interference Optical-Mode Resonance with Biquadratic Coupled FeCoB/Ru/FeCoB Trilayers

Zhang

Lin

Miao

et al. 2019

ACS Appl. Mater. Interfaces

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Microwave soft magnetic films (SMFs) are the key materials to effectively miniaturize and multifunctionalize the microwave electromagnetic components and devices. However, currently, single-layer SMFs encounter a frequency bottleneck at around 10 GHz. The ferromagnet/nonmagnetic spacer/ferromagnet sandwiched films with strong interlayer exchange coupling are possible solutions to break through that frequency limitation because they exhibit ultrahigh optical-mode (OM) resonance frequency f r O up to 50 GHz, while the tiny permeability and the limited thickness are their own obstacles to overcome. In this study, biquadratic coupled FeCoB25nm/Ru0.25nm/FeCoB25nm sandwiched films with uniaxial magnetic anisotropy were deposited by a composition gradient sputtering method. Pure OM resonance with self-bias f r O up to 18.21 GHz and a relative permeability μr O as high as 169 at the cut-off frequency was achieved. Moreover, both the f r O and μr O remain unchanged in the magnetic field range of 0–80 Oe, indicating a strong anti-interference capability to small interference field. These results demonstrate that the biquadratic coupled OM resonance can solve the current frequency bottleneck of microwave SMFs by providing ultrahigh resonance frequency while maintaining considerable permeability, thus leading to potential applications of OM resonance in Ku-band microwave magnetic components.

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“…Thus,the optical and acoustic magnon modes that are usually reported in SAFs are from bilayers. [135][136][137] The uniform optical and acoustic antiferromagnetic resonances frequencies of bilayers can modeled and obtained by linearizing a coupled pair of equations that are based on the Landau-Lifshitz-Gilbert (LLG) equation:…”

Section: Magnon-magnon Coupling Mechanisms In Layered Systemsmentioning

confidence: 99%

Quantum Engineering With Hybrid Magnonic Systems and Materials (Invited Paper)

Awschalom

et al. 2021

IEEE Trans. Quantum Eng.

105

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Quantum technology has made tremendous strides over the past two decades with remarkable advances in materials engineering, circuit design and dynamic operation. In particular, the integration of different quantum modules has benefited from hybrid quantum systems, which provide an important pathway for harnessing the different natural advantages of complementary quantum systems and for engineering new functionalities. This review focuses on the current frontiers with respect to utilizing magnetic excitatons or magnons for novel quantum functionality. Magnons are the fundamental excitations of magnetically ordered solid-state materials and provide great tunability and flexibility for interacting with various quantum modules for integration in diverse quantum systems. The concomitant rich variety of physics and material selections enable exploration of novel quantum phenomena in materials science and engineering. In addition, the relative ease of generating strong coupling and forming hybrid dynamic systems with other excitations makes hybrid magnonics a unique platform for quantum engineering. We start our discussion with circuit-based hybrid magnonic systems, which are coupled with microwave photons and acoustic phonons. Subsequently, we are focusing on the recent progress of magnon-magnon coupling within confined magnetic systems. Next we highlight new opportunities for understanding the interactions between magnons and nitrogen-vacancy centers for quantum sensing and implementing quantum interconnects. Lastly, we focus on the spin excitations and magnon spectra of novel quantum materials investigated with advanced optical characterization.

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Dual-mode ferromagnetic resonance in an FeCoB/Ru/FeCoB synthetic antiferromagnet with uniaxial anisotropy

Cited by 16 publications

References 33 publications

Zero-field Optic Mode Beyond 20 GHz in a Synthetic Antiferromagnet

Zero-field Optic Mode Beyond 20 GHz in a Synthetic Antiferromagnet

Ultrahigh Frequency and Anti-Interference Optical-Mode Resonance with Biquadratic Coupled FeCoB/Ru/FeCoB Trilayers

Quantum Engineering With Hybrid Magnonic Systems and Materials (Invited Paper)

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