High propagating velocity of spin waves and temperature dependent damping in a CoFeB thin film

Yu, Haiming; Huber, Rupert; Schwarze, Thomas; Brandl, Florian; Rapp, Teresa L.; Berberich, P.; Duerr, G.; Grundler, D.

doi:10.1063/1.4731273

Cited by 85 publications

(59 citation statements)

References 33 publications

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“…Providing small spin-wave damping and large spin-wave group velocities the magnetically isotropic alloy CoFeB has already been found to be attractive for magnonics [21]. In this work we make use of the magnetostrictive properties of CoFeB and demonstrate that the ferroelastic BaTiO 3 domain pattern is fully transferred to a 50 nm thick CoFeB film [ Fig.…”

Section: Introductionmentioning

confidence: 99%

Spin waves in CoFeB on ferroelectric domains combining spin mechanics and magnonics

Brandl

Franke

Lahtinen

et al. 2014

Solid State Communications

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Spin dynamics controlled by magnetoelastic coupling and applied electric fields might play a vital role in future developments of magnonics, i.e., the exploitation of spin waves for the transmission and processing of information.We have performed broadband spin-wave spectroscopy on a magnetostrictive CoFeB alloy grown on a ferrolectric BaTiO 3 substrate causing elastic strain with a quasi-periodic modulation. We find characteristic eigenfrequencies and spin-wave modes with large group velocities and small damping. These results suggest bright perspectives for electric-field control of reprogrammable magnonics.

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Section: Introductionmentioning

confidence: 99%

Spin waves in CoFeB on ferroelectric domains combining spin mechanics and magnonics

Brandl

Franke

Lahtinen

et al. 2014

Solid State Communications

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“…Their large saturation magnetization favors fast spin dynamics 25 and provides one with large stray fields from nanoscopic tips, respectively, helping to improve magnetic microscopy. 26 Magnetic nanotubes were fabricated from either Ni or CoFeB by depositing the ferromagnetic shells around bottom-up grown GaAs nanowires.…”

Section: -3mentioning

confidence: 99%

“…29 The Ni was deposited by ALD, 21,23 while the CoFeB was obtained by magnetron sputtering using Xenon gas at room temperature. 25 In the ALD process, we intentionally produced an intermediate Al 2 O 3 layer in order to vary the inner diameter of the supporting core before depositing the ferromagnetic shell. For magnetron sputtering of CoFeB, we mounted the Si (111) substrate containing the GaAs nanowires on a rotatable sample holder facing a Co 20 Fe 60 B 20 (CoFeB) target that was positioned under an angle of 35…”

Section: -3mentioning

confidence: 99%

Anisotropic magnetoresistance of individual CoFeB and Ni nanotubes with values of up to 1.4% at room temperature

et al. 2014

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Magnetic nanotubes (NTs) are interesting for magnetic memory and magnonic applications. We report magnetotransport experiments on individual 10 to 20 μm long Ni and CoFeB NTs with outer diameters ranging from 160 to 390 nm and film thicknesses of 20 to 40 nm. The anisotropic magnetoresistance (AMR) effect studied from 2 K to room temperature (RT) amounted to 1.4% and 0.1% for Ni and CoFeB NTs, respectively, at RT. We evaluated magnetometric demagnetization factors of about 0.7 for Ni and CoFeB NTs having considerably different saturation magnetization. The relatively large AMR value of the Ni nanotubes is promising for RT spintronic applications. The large saturation magnetization of CoFeB is useful in different fields such as magnonics and scanning probe microscopy using nanotubes as magnetic tips.

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“…The effect of metallization is negligible for thin films made of materials with low magnetisation, it is already for Py. Thus, the new materials with high magnetization, like a CoFeB alloys proposed recently for magnonics applications 38,39 or Heusler alloys [40][41][42] might be useful for a fabrication the structures with high nonreciprocal effect and high velocity of SW with reasonable value of damping.…”

Section: B Maximizing the Influence Of Metalmentioning

confidence: 99%

Nonreciprocal dispersion of spin waves in ferromagnetic thin films covered with a finite-conductivity metal

Mruczkiewicz

Krawczyk

2014

Journal of Applied Physics

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We study the effect of one-side metallization of a uniform ferromagnetic thin film on its spin-wave dispersion relation in the Damon-Eshbach geometry. Due to the finite conductivity of the metallic cover layer on the ferromagnetic film the spin-wave dispersion relation may be nonreciprocal only in a limited wave-vector range. We provide an approximate analytical solution for the spin-wave frequency, discuss its validity and compare it with numerical results. The dispersion is analyzed systematically by varying the parameters of the ferromagnetic film, the metal cover layer and the value of the external magnetic field. The conclusions drawn from this analysis allow us to define a structure based on a 30 nm thick CoFeB film with an experimentally accessible nonreciprocal dispersion relation in a relatively wide wave-vector range.

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High propagating velocity of spin waves and temperature dependent damping in a CoFeB thin film

Cited by 85 publications

References 33 publications

Spin waves in CoFeB on ferroelectric domains combining spin mechanics and magnonics

Spin waves in CoFeB on ferroelectric domains combining spin mechanics and magnonics

Anisotropic magnetoresistance of individual CoFeB and Ni nanotubes with values of up to 1.4% at room temperature

Nonreciprocal dispersion of spin waves in ferromagnetic thin films covered with a finite-conductivity metal

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