Nanoscale control of perpendicular magnetic anisotropy, coercive force and domain structure in ultrathin Ru/Co/W/Ru films

Kolesnikov, Alexander; Ognev, A. V.; Chebotkevich, L. A.; Герасименко, А. В.; Samardak, Alexander S.

doi:10.1016/j.jmmm.2018.01.056

Cited by 12 publications

(16 citation statements)

References 49 publications

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“…We assume that these features are associated with the presence of the largest Dzyaloshinskii-Moriya interaction in the sample [17]. In our previous study, the value of DMI D= 0.2 𝑚𝐽/𝑚 2 was measured [32]. In the Ru/Co/Ru/W samples, these features disappear, which may be due to the absence of DMI.…”

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confidence: 80%

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Advanced Method for the Reliable Estimation of Spin-Orbit-Torque Efficiency in Low-Coercivity Ferromagnetic Multilayers

et al. 2019

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An experimental study of current-induced magnetization reversal of the Ru/Co/Ru and Ru/Co/Ru/W structures was carried out. In the considered structures, due to the small value of the coercive force comparable in magnitude to the Oersted field and the SOT effect field, magnetization reversal is carried out by moving a domain wall parallel to the direction of current injection. For such a case, a new method for estimating the effective field of SOT based on the analysis of the domain wall position taking into account the distribution of the Oersted field was proposed. This method allowed determining the effective longitudinal field / = 1.6 • 10 −11 / −2 and the efficiency of SOT = 0.03 in the quasi-symmetric Ru/Co/Ru structure. It was found that adding the W capping layer enhances the SOT effect by 5 times. I.

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confidence: 80%

“…The values of current density j and effective field 𝜇 0 𝐻 𝐿 were substituted by values experimentally defined for I=60 mA. The effective thickness of the ferromagnetic layer was determined as the thickness of the Co layer equal to 0.5 nm taking into account the magnetic dead layer of 0.2 nm at each interface with Ru [32].…”

Section: Table IImentioning

confidence: 99%

Advanced Method for the Reliable Estimation of Spin-Orbit-Torque Efficiency in Low-Coercivity Ferromagnetic Multilayers

et al. 2019

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“…Based on the analysis of the magnetic properties and DMI of Ru/Co/W/Ru films, we assumed that t W = 0.24 nm corresponds to a single atomic layer. 20 The crystal structure and interface quality were studied using X-ray diffraction (XRD) and X-ray reflectivity (XRR) measurement techniques (SmartLab, RIGAKU) at CuKa radiation wavelength (1.54184 Å). As a result of the experimental data fitting, we defined the following parameters of each interface: magnetically dead layer (MDL) thickness L and root mean square (RMS) roughness d. More details can be found elsewhere.…”

Section: Experimental Characterizationmentioning

confidence: 99%

“…As a result of the experimental data fitting, we defined the following parameters of each interface: magnetically dead layer (MDL) thickness L and root mean square (RMS) roughness d. More details can be found elsewhere. 20 The magnetic properties of the films were investigated with a vibrating sample magnetometer (7410 VSM, LakeShore). Fig.…”

Section: Experimental Characterizationmentioning

confidence: 99%

“…Recently we have found in the Ru/Co/W/Ru system having perpendicular magnetic anisotropy (PMA) that the introduction of just 0.24 nm of W at the upper interface of Co leads to the appearance of a large negative DMI near À3.1 mJ m À2 accompanied by a tenfold decrease in the coercive force, but with preserved PMA. 20,21 Using micromagnetic simulations, we revealed the presence of homochiral Ne ´el domain walls, which are energetically not favourable in this system, but they can only be formed in the presence of strong chiral interactions. Since extrinsic SOC depends on spin angular momentum, 22 X-ray absorption spectroscopy (XAS) can be exploited to measure orbital moments and shed light on the intermixinginduced DMI in FM/HM structures.…”

Section: Introductionmentioning

confidence: 96%

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XMCD and ab initio study of interface-engineered ultrathin Ru/Co/W/Ru films with perpendicular magnetic anisotropy and strong Dzyaloshinskii–Moriya interaction

Samardak

Ognev

Kolesnikov

et al. 2022

Phys. Chem. Chem. Phys.

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Increased Efficiency of Current‐Induced Motion of Chiral Domain Walls by Interface Engineering

Guan

Zhou

et al. 2021

Advanced Materials

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Magnetic racetrack devices are promising candidates for next‐generation memories. These spintronic shift‐register devices are formed from perpendicularly magnetized ferromagnet/heavy metal thin‐film systems. Data are encoded in domain wall magnetic bits that have a chiral Néel structure that is stabilized by an interfacial Dzyaloshinskii–Moriya interaction. The bits are manipulated by spin currents generated from electrical currents that are passed through the heavy metal layers. Increased efficiency of the current‐induced domain wall motion is a prerequisite for commercially viable racetrack devices. Here, significantly increased efficiency with substantially lower threshold current densities and enhanced domain wall velocities is demonstrated by the introduction of atomically thin 4d and 5d metal “dusting” layers at the interface between the lower magnetic layer of the racetrack (here cobalt) and platinum. The greatest efficiency is found for dusting layers of palladium and rhodium, just one monolayer thick, for which the domain wall's velocity is increased by up to a factor of 3.5. Remarkably, when the heavy metal layer is formed from the dusting layer material alone, the efficiency is rather reduced by an order of magnitude. The results point to the critical role of interface engineering for the development of efficient racetrack memory devices.

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Nanoscale control of perpendicular magnetic anisotropy, coercive force and domain structure in ultrathin Ru/Co/W/Ru films

Cited by 12 publications

References 49 publications

Advanced Method for the Reliable Estimation of Spin-Orbit-Torque Efficiency in Low-Coercivity Ferromagnetic Multilayers

Advanced Method for the Reliable Estimation of Spin-Orbit-Torque Efficiency in Low-Coercivity Ferromagnetic Multilayers

XMCD and ab initio study of interface-engineered ultrathin Ru/Co/W/Ru films with perpendicular magnetic anisotropy and strong Dzyaloshinskii–Moriya interaction

Increased Efficiency of Current‐Induced Motion of Chiral Domain Walls by Interface Engineering

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