Frequency and power dependence of spin-current emission by spin pumping in a thin-film YIG/Pt system

Castel, Vincent; Vlietstra, N.; Wees, Bart van; Youssef, J. Ben

doi:10.1103/physrevb.86.134419

Cited by 85 publications

(66 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recent progress in the growth of YIG films allows for the fabrication of low-damping nanometer-thick YIG films [9][10][11]. Recently, Castel et al reported on the YIG thickness and frequency dependence of the spin-pumping process [29,30]. In contrast to our investigations, they concentrate on rather thick (>200 nm) YIG films, which are much thicker than the exchange correlation length in YIG [31][32][33][34] and thicker than the Pt thickness.…”

Section: Introductionmentioning

confidence: 99%

Thickness and power dependence of the spin-pumping effect inY3Fe5O12/Pt heterostructures measured by the inverse spin Hall effect

et al. 2015

View full text Add to dashboard Cite

The dependence of the spin-pumping effect on the yttrium iron garnet (Y 3 Fe 5 O 12 , YIG) thickness detected by the inverse spin Hall effect (ISHE) has been investigated quantitatively. Due to the spin-pumping effect driven by the magnetization precession in the ferrimagnetic insulator Y 3 Fe 5 O 12 film a spin-polarized electron current is injected into the Pt layer. This spin current is transformed into electrical charge current by means of the ISHE. An increase of the ISHE voltage with increasing film thickness is observed and compared to the theoretically expected behavior. The effective damping parameter of the YIG/Pt samples is found to be enhanced with decreasing Y 3 Fe 5 O 12 film thickness. The investigated samples exhibit a spin mixing conductance of g ↑↓ eff = (3.87 ± 0.21) × 10 18 m −2 and a spin Hall angle between θ ISHE = 0.013 ± 0.001 and 0.045 ± 0.004 depending on the used spin-diffusion length. Furthermore, the influence of nonlinear effects on the generated voltage and on the Gilbert damping parameter at high excitation powers is revealed. It is shown that for small YIG film thicknesses a broadening of the linewidth due to nonlinear effects at high excitation powers is suppressed because of a lack of nonlinear multimagnon scattering channels. We have found that the variation of the spin-pumping efficiency for thick YIG samples exhibiting pronounced nonlinear effects is much smaller than the nonlinear enhancement of the damping.

show abstract

Section: Introductionmentioning

confidence: 99%

Thickness and power dependence of the spin-pumping effect inY3Fe5O12/Pt heterostructures measured by the inverse spin Hall effect

et al. 2015

View full text Add to dashboard Cite

show abstract

“…The magnetic field dependence shows the same magnetization behavior for all in-plane directions, indicating isotropic behavior of the magnetization in the film plane, with a low coercive field of only 0.06 mT. To saturate the magnetization of this YIG sample in the out-of-plane direction, an external magnetic field higher than the saturation field (μ 0 M s = 0.176 T) 5 has to be applied.…”

Section: Sample Characteristicsmentioning

confidence: 99%

“…A more detailed description of the used measurement technique can be found in Ref. 5. Figure 5(b) shows a measurement of the spin pumping voltage for both e-beam evaporated Pt and dc sputtered Pt on YIG.…”

Section: Comparison Of E-beam Evaporated and DC Sputtered Ptmentioning

confidence: 99%

“…The ISHE has been used to detect, for example, spin pumping into Pt from various materials such as permalloy 2 (Py) and yttrium iron garnet (YIG). [3][4][5] For the opposite effect, to use Pt as a spin current injector, a charge current is sent through the Pt, creating a transverse spin accumulation by the spin-Hall effect (SHE). [6][7][8] Recently, Weiler et al 9 and Huang et al 10 observed magnetoresistance (MR) effects in Pt on YIG and related those effects to magnetic proximity.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Spin-Hall magnetoresistance in platinum on yttrium iron garnet: Dependence on platinum thickness and in-plane/out-of-plane magnetization

et al. 2013

Self Cite

View full text Add to dashboard Cite

Spin-Hall magnetoresistance in platinum on yttrium iron garnet Vlietstra, N.; Shan, J.; Castel, V.; van Wees, B. J.; Ben Youssef, J. Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. The occurrence of spin-Hall magnetoresistance (SMR) in platinum (Pt) on top of yttrium iron garnet (YIG) has been investigated, for both in-plane and out-of-plane applied magnetic fields and for different Pt thicknesses [3, 4, 8, and 35 nm]. Our experiments show that the SMR signal directly depends on the in-plane and out-of-plane magnetization directions of the YIG. This confirms the theoretical description, where the SMR occurs due to the interplay of the spin-orbit interaction in the Pt and the spin-mixing conductance at the YIG/Pt interface. Additionally, the sensitivity of the SMR and spin pumping signals on the YIG/Pt interface conditions is shown by comparing two different deposition techniques (e-beam evaporation and dc sputtering).

show abstract

“…Fig. 2(a) shows the scanning electron microscope image of the studied NLSV device that was prepared on a 200-nm thick single-crystal YIG, having very low coercive field [2,4,17] [18]. To circumvent this problem, in Type-B devices (2 devices), we first deposit a 20 nm-thick Al strip (by DC sputtering) between the injector and detector Py wires.…”

mentioning

confidence: 99%

Control of spin current by a magnetic YIG substrate in NiFe/Al nonlocal spin valves

et al. 2015

Self Cite

View full text Add to dashboard Cite

We study the effect of a magnetic insulator (Yttrium Iron Garnet -YIG ) substrate on the spin transport properties of Ni80Fe20/Al nonlocal spin valve (NLSV) devices. The NLSV signal on the YIG substrate is about 2 to 3 times lower than that on a non magnetic SiO2 substrate, indicating that a significant fraction of the spin-current is absorbed at the Al/YIG interface. By measuring the NLSV signal for varying injector-to-detector distance and using a three dimensional spin-transport model that takes spin current absorption at the Al/YIG interface into account we obtain an effective spin-mixing conductance G ↑↓ 5 − 8 × 1013 Ω −1 m −2 . We also observe a small but clear modulation of the NLSV signal when rotating the YIG magnetization direction with respect to the fixed spin polarization of the spin accumulation in the Al. Spin relaxation due to thermal magnons or roughness of the YIG surface may be responsible for the observed small modulation of the NLSV signal.The coupled transport of spin, charge and heat in nonmagnetic (N) metals deposited on the magnetic insulator Y 3 Fe 5 O 12 (YIG) has led to new spin caloritronic device concepts such as thermally driven spin currents, the generation of spin angular momentum via the spin Seebeck effect (SSE) [1], spin pumping from YIG to metals [2], spin-orbit coupling (SOC) induced magnetoresistance effects [3,4] and the spin Peltier effect, i.e., the inverse of the SSE that describes cooling/heating by spin currents [5]. In these spin caloritronic phenomena, the spinmixing conductance G ↑↓ of the N/YIG interface controls the transfer of spins from the conduction electrons in N to the magnetic excitations (magnons) in the YIG, or vice versa [6][7][8][9][10]. The interconversion of spin current to a voltage employs the (inverse) spin Hall effect in heavymetals such as Pt or Pd. The possible presence of proximity induced magnetism in these metals is reported to introduce spurious magnetothermoelectric effects [11,12] or enhance G ↑↓ [7]. Owing to the short spin-diffusion length λ in these large SOC metals, the applicability of the diffusive spin-transport model is also questionable. Experimental measurements that alleviate these concerns are however scarce and hence are highly required.In this article, we investigate the interaction of spin current (in the absence of a charge current) with the YIG magnetization using the NLSV geometry [13][14][15]. Using a metal with low SOC and long spin-diffusion length allows to treat our experiment using the diffusive spin-transport model. We find that the NLSV signal on the YIG substrate is two to three times lower than that on the SiO 2 substrate, indicating significant spincurrent absorption at the Al/YIG interface. By varying the angle between the induced spin accumulation and the YIG magnetization direction we observe a small but clear modulation of the NLSV signal. We also find that modifying the quality of the Al/YIG interface, using different thin-film deposition methods [4], influences G ↑↓ and hence the size of the spin current...

show abstract

Frequency and power dependence of spin-current emission by spin pumping in a thin-film YIG/Pt system

Cited by 85 publications

References 31 publications

Thickness and power dependence of the spin-pumping effect inY3Fe5O12/Pt heterostructures measured by the inverse spin Hall effect

Thickness and power dependence of the spin-pumping effect inY3Fe5O12/Pt heterostructures measured by the inverse spin Hall effect

Spin-Hall magnetoresistance in platinum on yttrium iron garnet: Dependence on platinum thickness and in-plane/out-of-plane magnetization

Control of spin current by a magnetic YIG substrate in NiFe/Al nonlocal spin valves

Contact Info

Product

Resources

About