Dependence of interfacial Dzyaloshinskii–Moriya interaction and perpendicular magnetic anisotropy on the thickness of the heavy-metal layer

Kim, NH Nam; Han, Dong‐Soo; Jung, Jinyong; Park, Kwonjin; Swagten, Hjm Henk; Kim, JS June Seo; You, Chun‐Yeol

doi:10.7567/apex.10.103003

Cited by 33 publications

(29 citation statements)

References 39 publications

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“…A linear relation between D and K u is also found. A similar result has been previously reported for a perpendicular AlO x / Co / Pt structure [145].…”

Section: Temperature Dependence Of Magnetic Parameters In Perpendicular Magnetic Thin Filmssupporting

confidence: 91%

Voltage control of skyrmions: Creation, annihilation, and zero-magnetic field stabilization

Zhou

Mansell

Dijken

2021

Applied Physics Letters

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Voltage manipulation of skyrmions is a promising path toward low-energy spintronic devices. Here, voltage effects on skyrmions in a GdOx/Gd/Co/Pt heterostructure are observed experimentally. The results show that the skyrmion density can be both enhanced and depleted by the application of an electric field, along with the ability, at certain magnetic fields to completely switch the skyrmion state on and off. Further, a zero magnetic field skyrmion state can be stabilized at a negative bias voltage using a defined voltage and magnetic field sequence. The voltage effects measured here occur on a few-second timescale, suggesting an origin in voltage-controlled magnetic anisotropy rather than ionic effects. By investigating the skyrmion nucleation rate as a function of temperature, we extract the energy barrier to skyrmion nucleation in our sample. Further, micromagnetic simulations are used to explore the effect of changing the anisotropy and Dzyaloshinskii–Moriya interaction on skyrmion density. Our work demonstrates the control of skyrmions by voltages, showing functionalities desirable for commercial devices.

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“…A linear relation between D and K u is also found. A similar result has been previously reported for a perpendicular AlO x / Co / Pt structure [145].…”

Section: Temperature Dependence Of Magnetic Parameters In Perpendicular Magnetic Thin Filmssupporting

confidence: 91%

Voltage control of skyrmions: Creation, annihilation, and zero-magnetic field stabilization

Zhou

Mansell

Dijken

2021

Applied Physics Letters

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“…We should mention that a quadratic dependence is theoretically predicted from perturbation theories for PMA [46] and iDMI [47], since iDMI energy results from the first order of the SOC, while the interface PMA comes from its second order. However, a linear correlation between K s and D eff has been reported experimental in Pt/Co/AlO x system from the study of the dependence of the two quantities on the Pt thickness [48]. This linear behavior was attributed to the narrow variation range of PMA and/or iDMI in which the correlation is investigated, as we observed for 0.3 nm t Cu 2.4 nm.…”

Section: B Effect Of the Tao X And Spacer Thicknessessupporting

confidence: 52%

Interface phenomena in ferromagnet/ TaOx -based systems: Damping, perpendicular magnetic anisotropy, and Dzyaloshinskii-Moriya interaction

Mokhtari

Roussigné

Chérif

et al. 2020

Phys. Rev. Materials

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Microstrip line ferromagnetic resonance (MS-FMR) and Brillouin light scattering (BLS) in the Damon-Eshbach geometry were used to investigate the perpendicular magnetic anisotropy (PMA), the damping and the interfacial Dzyaloshinskii-Moriya (iDMI) interaction in ferromagnetic (FM)/TaO x -based systems as a function of the ferromagnetic (FM = Co or Co 8 Fe 72 B 20 ) and the TaO x thicknesses (oxidation level). The analysis of the experimental FMR and BLS data has shown that the effective magnetization, the Gilbert damping parameter α and the iDMI are inversely proportional to the CoFeB and the Co films thickness. The BLS investigation of the iDMI variation versus the TaO x thickness and oxidation level reveals a contribution of FM/TaO x mediated by the presence of a Rashba field at this interface. Finally, we evidenced a correlation between iDMI and PMA by varying the Cu spacer thickness in the Pt/Cu/Co/TaO x system and we showed that both PMA and iDMI are localized at the first atomic monolayers of the Pt/Co interface. The observed non-linear dependence of PMA versus iDMI constant is attributed to similar interface orbital hybridizations involved in both quantities.

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“…Similarly, the dependence of the DMI on the heavy metal thickness has been studied for both Co (Kim et al, 2017b) and CoFeB (Chen et al, 2018b;Tacchi et al, 2017) films in contact with a Pt layer. For both systems the DMI intensity was found to increase with the Pt thickness, d Pt , reaching a saturation value when d Pt approaches the Pt spin diffusion length (about 2 nm).…”

Section: Brillouin Light Scatteringmentioning

confidence: 99%

Measuring interfacial Dzyaloshinskii-Moriya interaction in ultra-thin magnetic films

Kuepferling¹,

Casiraghi²,

Soares³

et al. 2020

Preprint

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The Dzyaloshinskii-Moriya interaction (DMI), being one of the origins for chiral magnetism, is currently attracting huge attention in the research community focusing on applied magnetism and spintronics. For future applications an accurate measurement of its strength is indispensable. In this work, we present a review of the state of the art of measuring the coefficient D of the Dzyaloshinskii-Moriya interaction, the DMI constant, focusing on systems where the interaction arises from the interface between two materials. The measurement techniques are divided into three categories: a) domain wall based measurements, b) spin wave based measurements and c) spin orbit torque based measurements. We give an overview of the experimental techniques as well as their theoretical background and models for the quantification of the DMI constant D. We analyze the advantages and disadvantages of each method and compare D values in different stacks. The review aims to obtain a better understanding of the applicability of the different techniques to different stacks and of the origin of apparent disagreement of literature values.

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Dependence of interfacial Dzyaloshinskii–Moriya interaction and perpendicular magnetic anisotropy on the thickness of the heavy-metal layer

Cited by 33 publications

References 39 publications

Voltage control of skyrmions: Creation, annihilation, and zero-magnetic field stabilization

Voltage control of skyrmions: Creation, annihilation, and zero-magnetic field stabilization

Interface phenomena in ferromagnet/ TaOx -based systems: Damping, perpendicular magnetic anisotropy, and Dzyaloshinskii-Moriya interaction

Measuring interfacial Dzyaloshinskii-Moriya interaction in ultra-thin magnetic films

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