Engineering optical mode ferromagnetic resonance in FeCoB films with ultrathin Ru insertion

Li, Shandong; Wang, Cuiling; Chu, Xiangcheng; Miao, Guo‐Xing; Xue, Qian; Zou, Weibao; Liu, Meimei; Xu, Jie; Li, Qiang; Dai, Yatang; Shen, Yan; Kang, Shishou; Long, Yun‐Ze; Lu, Yang

doi:10.1038/srep33349

Cited by 39 publications

(22 citation statements)

References 35 publications

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“…This line is attributed to an exchange mode of the coupled YIG/Co system. This is in agreement with previous observations of exchange modes in coupled systems [17–19]. A qualitatively similar transmission spectrum is observed for the YIG/Co(35) sample (for details see Fig.…”

supporting

confidence: 92%

Spin-Torque Excitation of Perpendicular Standing Spin Waves in Coupled YIG/Co Heterostructures

et al. 2018

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We investigate yttrium iron garnet (YIG)/cobalt (Co) heterostructures using broadband ferromagnetic resonance (FMR). We observe an efficient excitation of perpendicular standing spin waves (PSSWs) in the YIG layer when the resonance frequencies of the YIG PSSWs and the Co FMR line coincide. Avoided crossings of YIG PSSWs and the Co FMR line are found and modeled using mutual spin pumping and exchange torques. The excitation of PSSWs is suppressed by a thin aluminum oxide (AlOx) interlayer but persists with a copper (Cu) interlayer, in agreement with the proposed model.

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confidence: 92%

Spin-Torque Excitation of Perpendicular Standing Spin Waves in Coupled YIG/Co Heterostructures

et al. 2018

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“…This optic mode has been studied by several groups due to its potential to significantly enhance self-biased ferromagnetic resonances towards low-terahertz frequencies [36]. In recent works, notable enhancements to the f r frequency were demonstrated by Li et al [37] who reported a zero-field optic mode resonance of 11.32 GHz. Further, SAFs fabricated using a range of ferromagnetic components have been explored including Ni-Fe [38], Co [39,40] and (Fe,Co)N [41].…”

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confidence: 99%

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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“…Figure b,c shows the magnetic hysteresis loops of (Pt/Co) 2 /Ru/(Co/Pt) 2 onto mica substrates with different Ru thicknesses ( t Ru ) at an initial flat state. SAF multilayer is a sandwich structure, in which two FM layers are separated by a nonmagnetic (NM) layer . The two FM layers and NM spacer layer have indirect interaction through IEC .…”

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confidence: 99%

Ionic Gel Modulation of RKKY Interactions in Synthetic Anti‐Ferromagnetic Nanostructures for Low Power Wearable Spintronic Devices

Zhou

Wang

et al. 2018

Advanced Materials

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To meet the demand of developing compatible and energy-efficient flexible spintronics, voltage manipulation of magnetism on soft substrates is in demand. Here, a voltage tunable flexible field-effect transistor structure by ionic gel (IG) gating in perpendicular synthetic anti-ferromagnetic nanostructure is demonstrated. As a result, the interlayer Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction can be tuned electrically at room temperature. With a circuit gating voltage, anti-ferromagnetic (AFM) ordering is enhanced or converted into an AFM-ferromagnetic (FM) intermediate state, accompanying with the dynamic domain switching. This IG gating process can be repeated stably at different curvatures, confirming an excellent mechanical property. The IG-induced modification of interlayer exchange coupling is related to the change of Fermi level aroused by the disturbance of itinerant electrons. The voltage modulation of RKKY interaction with excellent flexibility proposes an application potential for wearable spintronic devices with energy efficiency and ultralow operation voltage.

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Engineering optical mode ferromagnetic resonance in FeCoB films with ultrathin Ru insertion

Cited by 39 publications

References 35 publications

Spin-Torque Excitation of Perpendicular Standing Spin Waves in Coupled YIG/Co Heterostructures

Spin-Torque Excitation of Perpendicular Standing Spin Waves in Coupled YIG/Co Heterostructures

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

Ionic Gel Modulation of RKKY Interactions in Synthetic Anti‐Ferromagnetic Nanostructures for Low Power Wearable Spintronic Devices

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