Magnetic properties of antiferromagnetically coupled CoFeB/Ru/CoFeB

Wiese, N.; Dimopoulos, Théodoros; Rührig, M.; Wecker, J.; Brückl, Hubert; Reiss, Günter

doi:10.1016/j.jmmm.2004.11.539

Cited by 12 publications

(8 citation statements)

References 13 publications

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“…■ presented in Figure 2a. As expected from the literature, 26,38,41 the asymmetric SAF shows three different magnetic states� namely the ferromagnetic (FM,…”

Section: ■ Experimental Sectionsupporting

confidence: 80%

Giant Surface Acoustic Wave Nonreciprocity with Low Magnetoacoustic Insertion Loss in CoFeB/Ru/CoFeB Synthetic Antiferromagnets

Küß,

Glamsch,

Kunz

et al. 2023

ACS Appl. Electron. Mater.

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In this study, we optimize the nonreciprocal transmission of surface acoustic waves (SAWs) in a piezoelectric/ magnetic heterostructure loaded with a CoFeB(d A )/Ru(0.55 nm)/ CoFeB(d B ) synthetic antiferromagnet (SAF). The SAF is composed of two ferromagnetic layers separated by a thin nonmagnetic Ru spacer layer, providing strong antiferromagnetic interlayer exchange coupling. The optical spin wave (SW) mode shows a large nonreciprocal dispersion relation in conjunction with a narrow line width. Therefore, for oppositely propagating SAWs, the SAW-SW resonances can become fully separated. For the optimized CoFeB(16 nm)/Ru(0.55 nm)/CoFeB(5 nm) SAF, we demonstrate both, a giant nonreciprocal SAW transmission of ΔS ± /l f > 250 dB/mm and a very low magnetoacoustic insertion loss of IL Δ /l f < 1 dB/mm per length l f of the SAF in the acoustic path at frequencies above 5 GHz. These results yield the potential for the realization of novel microwave devices with nonreciprocal signal transmission, such as acoustic isolators. In addition, the experimental results are in excellent agreement with a phenomenological model that considers the dipolar fields of the SWs and takes the bilinear and biquadratic interlayer exchange coupling into account.

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“…■ presented in Figure 2a. As expected from the literature, 26,38,41 the asymmetric SAF shows three different magnetic states� namely the ferromagnetic (FM,…”

Section: ■ Experimental Sectionsupporting

confidence: 80%

Giant Surface Acoustic Wave Nonreciprocity with Low Magnetoacoustic Insertion Loss in CoFeB/Ru/CoFeB Synthetic Antiferromagnets

Küß,

Glamsch,

Kunz

et al. 2023

ACS Appl. Electron. Mater.

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“…• C. [13] Therefore, this material system is a promising candidate for integration as a soft magnetic electrode in MTJs.…”

mentioning

confidence: 99%

“…[11] The CoFeB/Ru/CoFeB AFi shows a low antiferromagnetic (AF) coupling strength in the order of −0.1mJ/m 2 in the 2nd AF coupling maximum and has been successfully integrated into a complete MTJ stack. [12] Furthermore, the thermal stability of these systems has been proven for annealing temperatures up to ∼ 350 • C. [13] Therefore, this material system is a promising candidate for integration as a soft magnetic electrode in MTJs.…”

mentioning

confidence: 99%

Strong temperature dependence of antiferromagnetic coupling in CoFeB/Ru/CoFeB

Wiese¹,

Dimopoulos²,

Rührig³

et al. 2007

Europhys. Lett.

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PACS 75.70.-i -Magnetic properties of thin films, surfaces, and interfaces PACS 75.50.Kj -Amorphous and quasicrystalline magnetic materials PACS 75.30.Gw -Magnetic anisotropyAbstract. -The temperature dependence of saturation and spin-flop fields for artificial ferrimagnets (AFi) based on antiparallel coupled CoFeB/Ru/CoFeB trilayers has been investigated in a temperature range between 80K and 600K. The results presented in this paper are relevant for magnetic devices using this system, e.g. magnetic-random access memory based on spin-flop switching. In good accordance to the theory, the saturation field H sat behaves like H sat ∝ H0(T /T0)/ sinh(T /T0) with a characteristic temperature of T0 ≈ 150K. Within this model, the Fermi velocity for the Ru layer is of the order of 10 5 m/s, therefore, explaining the strong variation of the coupling strength with the temperature in Ru based AFi. Furthermore, a strong uniaxial anisotropy of Ku = 2 × 10 3 J/m 3 with a small angular distribution of the anisotropy axes is observed for the AFi trilayers based on amorphous CoFeB alloys.

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“…Associated with crystallization at elevated temperature is a rise in coercivity 5 of AlO x MTJs fabricated with Co 60 Fe 20 B 20 electrodes. 6 There is also a similar rise in the RA product.…”

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confidence: 99%

Interface sharpening in CoFeB magnetic tunnel junctions

Pym

Lamperti

Tanner

et al. 2006

Applied Physics Letters

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We report grazing incidence x-ray scattering evidence for sharpening of the interface between amorphous Co60Fe20B20 and AlOx during in situ annealing below the Co60Fe20B20 crystallization temperature. Enhancement of the interference fringe amplitude in the specular scatter and the absence of changes in the diffuse scatter indicate that the sharpening is not a reduction in topological roughness but a reduction in the width of the chemical composition profile across the interface. The temperature at which the sharpening occurs corresponds to that at which a maximum is found in the tunneling magnetoresistance of magnetic tunnel junctions.

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Magnetic properties of antiferromagnetically coupled CoFeB/Ru/CoFeB

Cited by 12 publications

References 13 publications

Giant Surface Acoustic Wave Nonreciprocity with Low Magnetoacoustic Insertion Loss in CoFeB/Ru/CoFeB Synthetic Antiferromagnets

Giant Surface Acoustic Wave Nonreciprocity with Low Magnetoacoustic Insertion Loss in CoFeB/Ru/CoFeB Synthetic Antiferromagnets

Strong temperature dependence of antiferromagnetic coupling in CoFeB/Ru/CoFeB

Interface sharpening in CoFeB magnetic tunnel junctions

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