Non-Negligible Imaginary Part of the Spin-Mixing Conductance and its Impact on Magnetization Dynamics in Heavy-Metal–Ferromagnet Bilayers

Krysztofik, Adam; Graczyk, Piotr; Głowiński, Hubert; Coy, Emerson; Załęski, Karol; Gościańska, I.; Dubowik, J.

doi:10.1103/physrevapplied.13.054011

Cited by 18 publications

(18 citation statements)

References 59 publications

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“…Moreover, the effective fields, H DL and H FL (cf. Section 3.1 ), due to SHE and spin accumulation at the interfaces can be expressed as follows and To fit the appropriate magnetoresistance relations obtained from eq 7 , we use the following parameters: 37 , 54 − 56 ρ HM = 59 μΩ cm, ρ F 1( F 2) = 72.5 μΩ cm, λ HM = 1.8 nm, λ F 1 = λ F 2 = 7 nm, θ SH = 8%, θ AMR = 0.15%, β 1 = β 2 = 0.3, G s (1) = G s (2) = G r (1) = G i (1) = 10 15 Ω –1 m –2 , and G r (2) = G i (2) = 0.4 G r (1) . The parameters were also used to calculate SOT effective fields that turn out to be pivotal in the interpretation of the experimental data presented in Section 4.3 .…”

Section: Theorymentioning

confidence: 99%

Study of Spin–Orbit Interactions and Interlayer Ferromagnetic Coupling in Co/Pt/Co Trilayers in a Wide Range of Heavy-Metal Thickness

Ogrodnik

Grochot

Karwacki

et al. 2021

ACS Appl. Mater. Interfaces

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The spin–orbit torque, a torque induced by a charge current flowing through the heavy-metal-conducting layer with strong spin–orbit interactions, provides an efficient way to control the magnetization direction in heavy-metal/ferromagnet nanostructures, required for applications in the emergent magnetic technologies like random access memories, high-frequency nano-oscillators, or bioinspired neuromorphic computations. We study the interface properties, magnetization dynamics, magnetostatic features, and spin–orbit interactions within the multilayer system Ti(2)/Co(1)/Pt(0–4)/Co(1)/MgO(2)/Ti(2) (thicknesses in nanometers) patterned by optical lithography on micrometer-sized bars. In the investigated devices, Pt is used as a source of the spin current and as a nonmagnetic spacer with variable thickness, which enables the magnitude of the interlayer ferromagnetic exchange coupling to be effectively tuned. We also find the Pt thickness-dependent changes in magnetic anisotropies, magnetoresistances, effective Hall angles, and, eventually, spin–orbit torque fields at interfaces. The experimental findings are supported by the relevant interface structure-related simulations, micromagnetic, macrospin, as well as the spin drift-diffusion models. Finally, the contribution of the spin–orbital Edelstein–Rashba interfacial fields is also briefly discussed in the analysis.

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Section: Theorymentioning

confidence: 99%

Study of Spin–Orbit Interactions and Interlayer Ferromagnetic Coupling in Co/Pt/Co Trilayers in a Wide Range of Heavy-Metal Thickness

Ogrodnik

Grochot

Karwacki

et al. 2021

ACS Appl. Mater. Interfaces

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“…The imaginary part of the spin mixing conductance, Im(G ↑↓ ), is commonly neglected with an effective spin mixing conductance used instead. The imaginary component is usually assumed to be much smaller than the real component, however imaginary to real spin mixing conductance ratios, Gr = Im(G ↑↓ )/Re(G ↑↓ ), larger than one have been measured recently [43]. Fig.…”

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confidence: 99%

Role of an additional interfacial spin-transfer torque for current-driven skyrmion dynamics in chiral magnetic layers

et al. 2020

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Skyrmions can be driven by spin-orbit torques as a result of the spin Hall effect. Here we model an additional contribution in ultra-thin multilayers, arising from the spin accumulation at heavy metal / ferromagnetic interfaces and observe the effects on a large range of skyrmion diameters. The combination of the interfacial spin-transfer torque and the spin-orbit torque results in skyrmion motion which helps to explain the observation of small skyrmion Hall angles for skyrmion diameters less than 100 nm. We show that this additional term has a significant effect on the skyrmion dynamics and leads to rapidly decreasing skyrmion Hall angles for small skyrmion diameters, as well as a skyrmion Hall angle versus skyrmion velocity dependence nearly independent of the surface roughness characteristics. Also, the effect of various disordered energy landscapes, in the form of surface roughness, on the skyrmion Hall angle and velocity is shown to be largely drive-dependent. Our results show good agreement with those found in experiments thus concluding that the interfacial spin-transfer torque should be included in micromagnetics simulations for the reproduction of experimental results.

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“…Сдвиг резонансной частоты ФМР наблюдался в гетероструктурах Pt/YIG и объяснялся ферромагнитным упорядочением атомов Pt вблизи границы Pt/YIG [10]. Обе части спиновой проводимости были определены экспериментально в работе [11] для структуры Pt/финемет (Fe 66.5 CuNb 3 Si 13.5 B 6 Al 7 ) с использованием частотной зависимости ферромагнитного резонанса. Экспериментально показано, что мнимая часть спиновой проводимости границы определяется электронной структурой границы, связанной с ее сопротивлением, и величиной спиновой диффузии [11].…”

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“…Исследования кристаллической структуры полученных гетероструктур с помощью рентгеноструктурного анализа и просвечивающей электронной микроскопии показали, что рост гетероструктуры осуществляется по (более 10 GHz) частотах. Величина действительной части спиновой проводимости определяется с помощью следующего выражения [3,11]: На рис. 2 представлены зависимости резонансного поля H 0 от частоты СВЧ-воздействия F для пленки LSMO и двух гетероструктур SIO3/LSMO при направлении магнитного поля вдоль оси легкого намагничивания.…”

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“…Как показано в [6,11,18], Reg ↑↓ в основном определяется параметрами нормального металла: удельным сопротивлением и длиной спиновой диффузии. В то же время Img ↑↓ зависит от свойств границы раздела между ферромагнетиком и нормальным металлом, при этом величина спин-орбитального взаимодействия, а также качество границы играют важную роль [11].…”

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Спиновая Проводимость Границы Иридат/Манганит

Овсянников¹,

Константинян²,

A.³

et al. 2022

Письма В Журнал Технической Физики

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The results of studies of ferromagnetic resonance (FMR) of iridate/manganite epitaxial heterostructures in a wide range of microwave frequencies (1-20 GHz) are presented. The magnitudes of imaginary and real parts of the spin mixing conductance of the heterostructure boundary determin-ing the spin current were determined from the frequency dependence of the spin damping and changes in the resonance field of the FMR. It is shown that the value of the imaginary part of spin conductance is comparable to the real part, which may be caused by strong spin-orbit interaction present in 5d-oxides of transition metals (iridate).

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Non-Negligible Imaginary Part of the Spin-Mixing Conductance and its Impact on Magnetization Dynamics in Heavy-Metal–Ferromagnet Bilayers

Cited by 18 publications

References 59 publications

Study of Spin–Orbit Interactions and Interlayer Ferromagnetic Coupling in Co/Pt/Co Trilayers in a Wide Range of Heavy-Metal Thickness

Study of Spin–Orbit Interactions and Interlayer Ferromagnetic Coupling in Co/Pt/Co Trilayers in a Wide Range of Heavy-Metal Thickness

Role of an additional interfacial spin-transfer torque for current-driven skyrmion dynamics in chiral magnetic layers

Спиновая Проводимость Границы Иридат/Манганит

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