Depth profile of spin and orbital magnetic moments in a subnanometer Pt film on Co

Suzuki, Motohiro; Muraoka, H.; Inaba, Y.; Miyagawa, Hayato; Kawamura, N.; Shimatsu, T.; Maruyama, Hiroshi; Ishimatsu, Naoki; Isohama, Yoichi; Sonobe, Y.

doi:10.1103/physrevb.72.054430

Cited by 118 publications

(72 citation statements)

References 30 publications

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“…reported the spin and orbital moment values of Pt as 0.144 and 0.018 μ B , respectively, for the Co/Pt interface8. Both spin and orbital moment values of Pt deduced in our case are half of those estimated for the Co/Pt interface48 because of the suppression of the direct proximity between Co and Pt atoms. The perpendicular components in orbital moments of each element taken at NI were calculated to be 0.15, 0.01, and 0.005 μ B for Co, Cu, and Pt, respectively.…”

Section: Resultssupporting

confidence: 38%

Induced perpendicular magnetization in a Cu layer inserted between Co and Pt layers revealed by x-ray magnetic circular dichroism

Okabayashi

Koyama

Suzuki

et al. 2017

Sci Rep

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We used x-ray absorption spectroscopy and x-ray magnetic circular dichroism to investigate the effects of inserting Cu into Co/Pt interfaces, and found that a 0.4-nm-thick inserted Cu layer showed perpendicularly magnetized properties induced by the proximity effect through the Co and Pt layers. The dependence of the magnetic properties on the thickness of the Cu layers showed that the proximity effects between Co and Pt with perpendicular magnetic anisotropy can be prevented by the insertion of a Cu layer with a nominal threshold thickness of 0.7 nm. Element-specific magnetization curves were also obtained, demonstrating that the out-of-plane magnetization is induced in the Cu layers of the Co/Cu/Pt structures.

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Section: Resultssupporting

confidence: 38%

Induced perpendicular magnetization in a Cu layer inserted between Co and Pt layers revealed by x-ray magnetic circular dichroism

Okabayashi

Koyama

Suzuki

et al. 2017

Sci Rep

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“…Indeed, at the Au/Co interface μ Au = 0.031 μ B /atom. 48 On the other hand, in a Pt/Co bilayer Pt atoms acquire a magnetic momentum of μ Pt = 0.61 μ B /atom and the magnetic polarization exponentially decays with the distance from Co. 49 Moreover, in the case of Co/Pt multilayers it has been proposed that it is the interfacial hybridization between Co and Pt that produces an enhancement of MAE. 50 Based on all these observations we can propose the following interpretation.…”

Section: B Origin Of Magnetic Anisotropy In Co/pt Core-shell Nanodotsmentioning

confidence: 99%

Interplay between interfacial and structural properties on the magnetism of self-organized core-shell Co/Pt supported nanodots

et al. 2011

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We have studied the influence of Pt capping on the magnetic properties of self-organized Co nanodots by means of complementary structural and magnetic investigation techniques. The growth of monodisperse 5 nm diameter Co dots on a Au(111) surface and its progressive coverage by Pt were performed under ultrahigh vacuum conditions and imaged by scanning tunneling microscopy, revealing a weak mixing at room temperature. The Co/Pt core-shell structure was studied both by molecular-dynamics simulations and surface extended xray-absorption fine structure, showing a global dilatation of the Co core. Both magnetic moments and hysteresis cycles at various temperatures were measured using x-ray magnetic circular dichroism, revealing a slight increase of the magnetic moments and the out-of-plane magnetic anisotropy after Pt capping. Moreover, the variation of magnetic anisotropy as a function of capping was followed in situ by the magneto-optical Kerr effect. Our investigations demonstrate that interfacial hybridization between Co and Pt is dominant over magnetoelastic contribution in this system.

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“…The introduction of the helicity-modulation technique, which provides extremely high sensitivity and high statistical accuracy in XMCD measurements, has promoted studies of weak magnetization, such as paramagnetism 70) or magnetism induced in non- magnetic metals. 82,83) Sample environments with a high magnetic field (>10 T) and low temperature (<4 K), which are available from a superconducting magnet system, were necessary for the XMCD study of paramagnetic systems.…”

Section: Xmcd In Nanoparticles Composed Of Non-magnetic Elementsmentioning

confidence: 99%

Recent Progress of the X-ray Magnetic Circular Dichroism Technique for Element-Specific Magnetic Analysis

Nakamura

Suzuki

2013

J. Phys. Soc. Jpn.

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Recent trend of the X-ray magnetic circular dichroism (XMCD) spectroscopy-based technique and the related scientific topics at SPring-8 are reviewed. At the third-generation synchrotron radiation facility, the key developments in the XMCD technique include i) significant improvements in the accuracy and sensitivity of XMCD measurements with a quick helicity switching of circularly polarized X-rays, ii) introduction of extreme conditions (strong pulsed magnetic field and high pressures), and iii) new experimental setup using the high-brilliance X-ray source (microfocusing, reflection geometry, and high-pressure cells). These achievements have effectively extended the capability of the XMCD technique, a unique magnetic probe with an element-specificity, providing fundamental scientific insights in spintronics and magnetic recording devices, magnetic nanoparticles, and magnetism under high-magnetic field and high pressures.KEYWORDS: X-ray magnetic circular dichroism, element specific magnetic hysteresis, synchrotron radiation X-rays Historical ReviewElement-specific magnetic measurements are widely recognized as a powerful experimental technique for the study of magnetic materials and have previously been exploited mainly by Mössbauer spectroscopy. For the last 30 years, an energy-tunable and polarized X-ray source at synchrotron radiation facilities has given rather expansive possibilities of element-specific magnetic measurements using X-ray spectroscopy. Indeed, X-ray magnetic circular dichroism (XMCD) spectroscopy 1,2) has become one of the leading techniques for element-specific magnetic measurement using a resonant effect in the core-shell absorption with circularly polarized X-ray photons.The XMCD effect was first observed at the Fe K edge in the hard-X-ray region in 1987 by Schütz et al.3) In their experiment, an XMCD spectrum of pure iron was obtained by reversing the direction of magnetic fields applied to a sample, and the circularly polarized X-rays were provided by the off-orbital radiation from a bending magnet (off-plane method).3) The recorded XMCD signal was quite small, of the order of ÁI=I $ 5 Â 10 À3 . Subsequently, XMCD spectra at the L 2;3 edges of rare-earth elements [4][5][6] and at the L 2;3 edges of 5d metals in some alloys with 3d transition metals were also reported. 7) XMCD measurements over a wide energy range that is similar to the extended X-ray absorption fine structure (EXAFS), called magnetic EXAFS, in Fe and Gd 3 Fe 5 O 12 showed a capability of analyses of local magnetic structures using dichroic effects. 8,9) In the soft-X-ray region, the first XMCD spectrum at the Ni L 2;3 edges in a Ni single crystal was reported by Chen et al. in 1990. 10) The circularly polarized soft X-rays were obtained by the off-plain method, similar to the previous XMCD measurement at the Fe K edge.3) The intensity of the observed XMCD signal was about 8% with respect to the resonant absorption, the so called white line, and was much larger than that recorded at the K edge. The strong XMCD value at the...

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Depth profile of spin and orbital magnetic moments in a subnanometer Pt film on Co

Cited by 118 publications

References 30 publications

Induced perpendicular magnetization in a Cu layer inserted between Co and Pt layers revealed by x-ray magnetic circular dichroism

Induced perpendicular magnetization in a Cu layer inserted between Co and Pt layers revealed by x-ray magnetic circular dichroism

Interplay between interfacial and structural properties on the magnetism of self-organized core-shell Co/Pt supported nanodots

Recent Progress of the X-ray Magnetic Circular Dichroism Technique for Element-Specific Magnetic Analysis

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