Determination of magnetic anisotropies, interlayer coupling, and magnetization relaxation in FeCoB/Cr/FeCoB

Gong, Yu; Cevher, Zehra; Ebrahim, Mark; Lou, J.; Pettiford, C.; Sun, Nian X.; Ren, Yuhang

doi:10.1063/1.3225608

Cited by 31 publications

(13 citation statements)

References 37 publications

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“…The higher OM frequency f r O is especially suitable for microwave devices without applying magnetic fi eld. The AM and OM frequencies along the EA direction can be expressed as follows [ 30,31 ] 2 4…”

Section: The Control Of Om Frequency F R O and Inverse Switch Field H Swmentioning

confidence: 99%

Tunable Optical Mode Ferromagnetic Resonance in FeCoB/Ru/FeCoB Synthetic Antiferromagnetic Trilayers under Uniaxial Magnetic Anisotropy

et al. 2016

Adv Funct Materials

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Ferromagnetic resonance (FMR) is one of the most important characteristics of soft magnetic materials, which practically sets the maximum operation speed of these materials. There are two FMR modes in exchange coupled ferromagnet/nonmagnet/ferromagnet sandwich films. The acoustic mode has relatively lower frequency and is widely used in radio‐frequency/microwave devices, while the optical mode is largely neglected due to its tiny permeability even though it supports much higher frequency. Here, a realistic method is reported to enhance the permeability in the optical mode to an applicable level. FeCoB/Ru/FeCoB trilayers are carefully engineered with both uniaxial magnetic anisotropy and antiferromagnetic interlayer exchange coupling. This special magnetic structure exhibits a high optical mode frequency up to 11.28 GHz and a maximum permeability of 200 at resonance. An abnormally low inverse switch field (<200 Oe, less than 1/5 of the single layer) is observed which can effectively switch the system from optical mode with higher frequency into acoustic mode with lower frequency. The optical mode frequency and inverse switch field can be controlled by tailoring the interlayer coupling strengths and the uniaxial anisotropy fields, respectively. The tunable optical mode resonance thus can increase operation frequency while reduce operation field overhead in FMR based devices.

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Section: The Control Of Om Frequency F R O and Inverse Switch Field H Swmentioning

confidence: 99%

Tunable Optical Mode Ferromagnetic Resonance in FeCoB/Ru/FeCoB Synthetic Antiferromagnetic Trilayers under Uniaxial Magnetic Anisotropy

et al. 2016

Adv Funct Materials

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“…A/B > 1 gives Dysonian line shape to the spectrum which results from lower skin depth and higher conductivity of the sample [18]. Hence the possibility of occurrence of dispersive component due to diffusion of electrons into and out of the skin region cannot be ruled out for the ML with x = 249 and 83 nm.…”

Section: Effect Of Czf Layer Thicknessmentioning

confidence: 99%

FMR Studies of [SnO2/Cu-Zn Ferrite] Multilayers

Singh¹,

Saipriya²

2013

Ferromagnetic Resonance - Theory and Applications

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“…J RKKY is the effective RKKY interaction field, which can be determined directly by the FMR field difference between AM and OM modes (calculated in Figure ). A positive J RKKY indicates an AFM coupling whereas a negative J RKKY represents an FM coupling . Therefore, AM mode is higher than OM mode in FM coupling (0.4 nm) or lower than OM mode in AFM coupling (0.6 nm).…”

mentioning

confidence: 99%

“…The SAF heterostructures with RKKY interaction enable dual mode FMR spectra and we can identify both acoustic mode (AM) and optical mode (OM) in the measured spectra. The following simplified FMR equations can be used to describe the AM and OM modes along the in‐plane easy axis:

\frac{f}{γ} = \sqrt{(H_{r} - H_{k}) (H_{r} + 4 π M)}

\frac{f}{γ} = \sqrt{(H_{r} - H_{k} - J_{R K K Y}) (H_{r} - J_{R K K Y} + 4 π M)}

where f is the angular resonance frequency (9.76 GHz), γ is the gyromagnetic ratio of 2.8 MHz Oe −1 , H r is the resonance field, H k relates to the volume magnetocrystalline anisotropy, and 4 πM is 13 kOe for FeCoB at room temperature . J RKKY is the effective RKKY interaction field, which can be determined directly by the FMR field difference between AM and OM modes (calculated in Figure ).…”

mentioning

confidence: 99%

E‐field Control of the RKKY Interaction in FeCoB/Ru/FeCoB/PMN‐PT (011) Multiferroic Heterostructures

Wang

et al. 2018

Advanced Materials

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E-field control of antiferromagnetic (AFM) orders is promising for the realization of fast, compact, and energy-efficient AFM applications. However, as the AFM spins are strongly pinned, the E-field control process is mainly based on the exchange bias regulation that usually confines at a low temperature. Here, a new magnetoelectric (ME) coupling mechanism for the modulation of AFM orders at room temperature is explored. Based on the FeCoB/Ru/FeCoB/(011) Pb(Mg Nb )O -PbTiO (PMN-PT) synthetic antiferromagnetic (SAF) heterostructures, the external E-field generates relative magnetization switching in the two ferromagnetic (FM) layers, leading the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction tuning. This voltage-induced switching behavior can be repeated in a stable and reversible manner for various SAFs, which is a key challenge in the E-field control of AFM coupling and is not resolved yet. The voltage-induced RKKY interaction changes by analyzing the dynamic optical and acoustic modes is quantified, and with first-principles calculations, it is found that the distortion of the Fermi surface by the lattice reconstruction is the key of the relative magnetization switching and RKKY interaction modulation. This voltage control of the RKKY interaction in ME heterostructures provides an easy way to achieve the next generation of AFM/FM spintronic applications.

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Determination of magnetic anisotropies, interlayer coupling, and magnetization relaxation in FeCoB/Cr/FeCoB

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Cited by 31 publications

References 37 publications

Tunable Optical Mode Ferromagnetic Resonance in FeCoB/Ru/FeCoB Synthetic Antiferromagnetic Trilayers under Uniaxial Magnetic Anisotropy

Tunable Optical Mode Ferromagnetic Resonance in FeCoB/Ru/FeCoB Synthetic Antiferromagnetic Trilayers under Uniaxial Magnetic Anisotropy

FMR Studies of [SnO2/Cu-Zn Ferrite] Multilayers

E‐field Control of the RKKY Interaction in FeCoB/Ru/FeCoB/PMN‐PT (011) Multiferroic Heterostructures

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