Magnetization and anisotropy of Co/Pd multilayer thin films

Stinson, Douglas G.; Shin, Shung-Chul

doi:10.1063/1.344904

Cited by 69 publications

(24 citation statements)

References 8 publications

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“…33 It is well known that Pt is easily spin polarized and becomes ferromagnet when it is adjacent to the ferromagnetic layer due to the strong spinorbit coupling and band hybridizations. [34][35][36] Therefore, the spin polarized ferromagnetic Pt may contribute to the measured M s . Without further analysis on systems with a systematic variation of the Pt layer thickness as well (which is beyond the scope of this paper concentrating on iDMI), we are not able to discriminate between the two scenarios.…”

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confidence: 99%

Improvement of the interfacial Dzyaloshinskii-Moriya interaction by introducing a Ta buffer layer

Kim

Han

Jung

et al. 2015

Applied Physics Letters

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We report systematic measurements of the interfacial Dzyaloshinskii-Moriya interaction (iDMI) by employing Brillouin light scattering in Pt/Co/AlOx and Ta/Pt/Co/AlOx structures. By introducing a tantalum buffer layer, the saturation magnetization and the interfacial perpendicular magnetic anisotropy are significantly improved due to the better interface between heavy metal and ferromagnetic layer. From the frequency shift between Stokes- and anti-Stokes spin-waves, we successively obtain considerably larger iDM energy densities (Dmax = 1.65 ± 0.13 mJ/m2 at tCo = 1.35 nm) upon adding the Ta buffer layer, despite the nominally identical interface materials. Moreover, the energy density shows an inverse proportionality with the Co layer thickness, which is the critical clue that the observed iDMI is indeed originating from the interface between the Pt and Co layers.

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confidence: 99%

Improvement of the interfacial Dzyaloshinskii-Moriya interaction by introducing a Ta buffer layer

Kim

Han

Jung

et al. 2015

Applied Physics Letters

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“…With these properties, our material is comparable to typical Co/Pt or Co/Pd multilayers, [23][24][25][26][27][28] and in contrast to other low-pinning materials such as permalloy, it belongs to the class of high-anisotropy materials.…”

Section: Methodsmentioning

confidence: 66%

“…These materials have been commonly used in a wide range of experiments 1,3,[18][19][20][21][22] and are very well characterized. [23][24][25][26][27][28][29] Second, the pump-probe scheme relies on a deterministic and elastic response of the magnetic domains and domain walls to drive forces of up to GHz repetition rates. This requires a material with particularly low pinning to provide the high repeatability of the domain wall motion, which is also of key importance for applications.…”

Section: Introductionmentioning

confidence: 99%

Magnetic states in low-pinning high-anisotropy material nanostructures suitable for dynamic imaging

et al. 2013

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“…It is interesting to note that the saturation magnetizations in FeCdPd multilayer films are enhanced in comparison with those in FeCo alloys.or example, Feo,62Coo,3,/?d multilayer film has a 30% larger saturation magnetization than FeCo alloy having the same composition. Enhanced magnetization caused by the polarization of Pd has been reported in Cd Pd multilayer films by several investigators[4,11,12]. Broeder et al…”

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confidence: 87%

Magnetic and magneto-optical properties of Fe/sub x/Co/sub 1-x//Pd multilayer thin films

Shin

1992

IEEE Trans. Magn.

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Absfrucf -We report the dependence of the magnetization, anisotropy constant, and Kerr rotation on the Fe concentration in FexCol-JPd multilayer thin films, where the Fe concentration n varies between 0 and 100 percent with maintaining the same sublayer thicknesses of 2A FeCo and 9A Pd. Perpendicular magnetic anisotropy existed for the films having Fe concentration less than about 80 atomic percent. Enhanced magnetization, possibly due to the polarization of Pd, was observed in the full range of Fe concentration. No simple proportional relation between the Kerr rotation and the magnetization was observed in this system. I . INTRODUCTION Transition-metal (TM) based multilayer thin films have been the subject of numerous recent studies because of their novel properties such as perpendicular magnetic anisotropy [l-41 and the giant magnetoresistance [5]. Potential application to magneto -optical recording on the materials with perpendicular magnetic anisotropy has triggered a lot of investigations on these systems [6-81. So far the studies have been limited to TM element -based systems and little attention has been paidtoFeCoalloysystems. Inthispaper, wereportmagneticand magnetooptical properties of FeCoPd multilayer thin films and discuss a possibility to utilize these materials for magneto-optical recording media. II. EXF'ERJMENT Samples were prepared by e-beam evaporation of FeCo alloy and Pd element on glass substrates in a vacuum chamber maintained at about 2X low6 Torr during the deposition. The multilayer structure was achieved by alternately exposing the substrate to each of the two e -beam sources via a rotating substrate mount. Two e-beam sources were physically separated by stainless shields to prevent cross contamination of their evaporated fluxes. The deposition rates from the two sources were monitored by corresponding quartz crystal sensors. A typical deposition rate was 1 AIS with an average fluctuation of 10 % for FeCo and 4.5 AIS with an average fluctuation of 2 % for Pd. The Fe concentration in the FeCo sublayer was varied by evaporating FeCo alloys having different compositions. Although the composition was varied, the sublayer thicknesses of 2A FeCo and 9A Pd were kept constant in all samples.The film composition was determined by inductively coupled plasma (10) atomic emission spectrometry and the film structure, was investigated by 8 -28 scanning x-ray diffractometry. Magnetization was measured using a vibrating sample magnetometer (VSM) calibrated against Ni standard. The magnetic anisotropy was measured using a torque 1

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Magnetization and anisotropy of Co/Pd multilayer thin films

Cited by 69 publications

References 8 publications

Improvement of the interfacial Dzyaloshinskii-Moriya interaction by introducing a Ta buffer layer

Improvement of the interfacial Dzyaloshinskii-Moriya interaction by introducing a Ta buffer layer

Magnetic states in low-pinning high-anisotropy material nanostructures suitable for dynamic imaging

Magnetic and magneto-optical properties of Fe/sub x/Co/sub 1-x//Pd multilayer thin films

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