Interfacial effects on magnetic relaxation in Co/Pt multilayers

Yuan, Shujuan; Sun, L. Z.; Sang, H.; Du, Jun; Zhou, Shiming

doi:10.1103/physrevb.68.134443

Cited by 35 publications

(23 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In particular, a heavily enhanced damping, in comparison to bulk Co, has been observed for Co/Pt multilayers [43]. The Gilbert damping in these systems has been found, in a ferromagnetic resonance (FMR) experiment, to decrease with increasing the Co layer thickness [42]. A similar linear dependence on the inverse of the Co layer thickness has been reported for the Co/Pd multilayers in Ref.…”

Section: Introductionsupporting

confidence: 61%

“…Measurements of the damping constant α in [FM/NM] N binary superlattices have been reported by different experimental groups [22,23,[25][26][27][42][43][44][45][46][47][48][49][50][51][52]. The presence of NM layers in magnetic binary superlattices results in larger magnetic damping in comparison with the corresponding bulk ferromagnetic metals.…”

Section: Introductionmentioning

confidence: 99%

“…Determination of α in magnetic materials is of great interest due to its subtle role in spintronic devices, like magnetic sensors with the demand for large magnetic damping or MRAMs where low damping is desirable. Therefore, magnetic multilayers have been investigated experimentally also because they allow for engineering magnetic damping [25,[42][43][44][45].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Gilbert damping in binary magnetic multilayers

Barati

Cinal

2017

Phys. Rev. B

View full text Add to dashboard Cite

We present quantum mechanical calculations of the Gilbert damping constant α in ultrathin L1 0 [Co/NM] N superlattices and (001) fcc [Co/NM] N magnetic multilayers built of cobalt and nonmagnetic metals NM = Cu, Ag, Pd, Pt, and Au. The calculations are performed within a realistic nine-orbital tight-binding model of the band structure including spin-orbit interaction. The dependence of α on the stacking number N , ferromagnetic and nonmagnetic layer thicknesses as well as the electron scattering rate is investigated. The damping constant is shown to be the sum of a constant term (bulklike) and a 1/N term (due to external surfaces) which arise from interand intraband electronic transitions, respectively. The calculated α is found to be enhanced in the considered multilayers in comparison with its values for bulk Co and their bilayer counterparts with the same total Co thickness. The origin of this enhancement and the variation of α with the geometric structure of the multilayers are further investigated by analyzing the damping contributions from individual atomic layers. The obtained theoretical results for the damping constant are shown to be in good agreement with previous experimental observations in magnetic multilayers. In particular, the experimentally observed linear dependence on the ratio of NM (Pd or Pt) and Co layer thicknesses is reproduced in the present calculations.

show abstract

Section: Introductionsupporting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Gilbert damping in binary magnetic multilayers

Barati

Cinal

2017

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…The relationship of G ϰ ͑g −2͒ 2 has been found in FM/AF bilayers 15 and in other Cu/NiFe/Cu/Pt 21 and Co/Pt multilayers. 22 As reported previously, 7,15 the value of the g factor can be influenced by the effect of the exchange coupling at the FM/AF interface for a fixed FM layer thickness. It is well known that exchange anisotropy increases with decreasing t FM for FM/AF bilayers.…”

Section: A In-plane and Out-of-plane Angular Dependences Of Linewidthsmentioning

confidence: 59%

Increased ferromagnetic resonance linewidth and exchange anisotropy in NiFe/FeMn bilayers

Yuan

Kang

et al. 2009

Journal of Applied Physics

View full text Add to dashboard Cite

In the past investigations, the exchange-biased bilayers show much larger ferromagnetic resonance ͑FMR͒ linewidth than that of single ferromagnetic layer films. However, the mechanism of the large linewidth remains controversial. In this paper, the FMR linewidths of NiFe/FeMn bilayers prepared by dc magnetron sputtering system are systematically studied. Besides the intrinsic damping and magnetic inhomogeneity, the extrinsic relaxation based on two-magnon scattering process should be also considered to explain the strong in-plane angular dependence of the linewidths. The fitting of the out-of-plane angular dependence of the linewidths shows that the intrinsic Gilbert damping effect plays a major role in the increased linewidth in the bilayers. The value of the g factor increases due to the effect of the exchange coupling at the NiFe/FeMn interface, resulting in an enhancement in the Gilbert damping factor G. The fitting results indicate that the line broadening of the exchange-biased films is related to the exchange anisotropy. The effects of FeMn layer thickness, growth sequence of FeMn layer, and temperature on the linewidths further approve this interpretation.

show abstract

“…[3] Intensive studies on the magneto-optical properties of Co/Pt multilayered films as well as the Co-Pt alloy films have been carried out in the recent years because of the fundamental interests in these systems (for example, the induced magnetic polarization effect in the nonmagnetic Pt sublayers) and their potential for the practical applications such as storage medial [4] . Therefore, studies of FMR at microwave frequency in Co/Pt multilayers are helpful to uncover characteristics of the magnetization reversal process during the recording process [5] . In the study reported in this paper, we prepared Co/Pt multilayers with various Co layer thicknesses and various Pt layer thicknesses and measured the FMR spectra at room temperature.…”

Section: Introductionmentioning

confidence: 99%

Ferromagnetic resonance in Co/Pt multilayers

Yuan

Kuangdi

et al. 2007

J. of Shanghai Univ.

View full text Add to dashboard Cite

Out-of-plane angular dependence of ferromagnetic resonance spectra was measured in sputtered Co/Pt multilayers and analyzed with the Landau-Lifshitz-Gilbert equation. The effective demagnetizing field 4πM eff is found to increase with decreasing tPt and decreasing 1/tCo, which can be considered as a result of interplay between the interlayer coupling and a lowdimensional effect. The g factor increases with increasing tPt and decreasing tCo, indicating contribution of spin-polarization of Pt atoms and additional contribution of orbital moment of Co atoms. The in-plane resonance line-width increases with decreasing tCo and increases with increasing tPt.

show abstract

Interfacial effects on magnetic relaxation in Co/Pt multilayers

Cited by 35 publications

References 23 publications

Gilbert damping in binary magnetic multilayers

Gilbert damping in binary magnetic multilayers

Increased ferromagnetic resonance linewidth and exchange anisotropy in NiFe/FeMn bilayers

Ferromagnetic resonance in Co/Pt multilayers

Contact Info

Product

Resources

About