Anomalous magnetic hysteresis of Gd and Fe moments in a Gd/Fe multilayer measured by hard x-ray magnetic circular dichroism

Koizumi, Akira; Takagaki, Masafumi; Suzuki, Motohiro; Kawamura, N.; Sakai, Nobuhiko

doi:10.1103/physrevb.61.r14909

Cited by 38 publications

(29 citation statements)

References 23 publications

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“…The high sensitivity of the helicity-modulation technique allowed XMCD experiments to be conducted in diluted magnetic systems, 62) thin films, and multilayers, [63][64][65][66][67] all materials containing a small amount of the target magnetic elements of interest. Having a high signal-to-noise ratio is particularly useful for high-pressure XMCD measurements using a diamond anvil cell (DAC).…”

Section: Hard-x-ray Regionmentioning

confidence: 99%

“…71) Using this technique, one can separately observe the magnetization process of different magnetic elements in the sample. The ESMH technique has been typically applied to multilayers 63,64,71) and diluted magnetic alloys. Magnetization curves of the targeted elements that have a weak magnetization and/or are of a tiny volume can be extracted from larger diamagnetic signals of the substrate or matrix.…”

Section: Hard-x-ray Regionmentioning

confidence: 99%

See 1 more Smart Citation

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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Section: Hard-x-ray Regionmentioning

confidence: 99%

Section: Hard-x-ray Regionmentioning

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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“…In the Fe/Gd and Fe/Dy multilayer systems, on the other hand, twisted magnetic structures have been inferred experimentally [4][5][6] and theoretically. [7][8][9][10][11][12] The Fe/Tb multilayer system, lying between the Fe/Gd and Fe/Dy systems in the Periodic Table, is expected to have some kind of twisted magnetic structure, caused by the competition among the exchange coupling, the Zeeman energy, and the anisotropic energy.…”

Section: Introductionmentioning

confidence: 99%

The enhanced negative magnetoresistance of Fe/Tb multilayer at multiextreme conditions

Ohashi

Oomi

Ohmichi

et al. 2008

Journal of Applied Physics

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Magnetoresistance ͑MR͒ in Fe/Tb magnetic multilayer is studied under multiextreme conditions, i.e., high magnetic field, low temperature, and high pressure. The negative MR is observed to be 24.6% in ͓Fe͑12 nm͒ / Tb͑15 nm͔͒ 25 at 4.2 K, and MR is not saturated completely even up to 30 T. With increasing pressure, the magnitude of MR tends to be suppressed, indicating that magnetic order in the Tb layers is suppressed by applying pressure.

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“…In Fe/Re (Re: rare earth) multilayer system, on the other hand, twisted magnetic structures have been inferred experimentally [4,5,6] and theoretically [7,8,9,10,11,12]. We have been studied about Fe/Tb multilayer system [13,14,15], which is expected to have some kind of twisted magnetic structure caused by the competition among the exchange coupling, the Zeeman energy and the anisotropic energy.…”

Section: Introductionmentioning

confidence: 99%

The negative magnetoresistance of Fe/Tb magnetic multilayer

Ohashi

Oomi

Takano

et al. 2009

J. Phys.: Conf. Ser.

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Abstract. Magnetic twist driven magnetoresistance in Fe/Tb magnetic multilayer is studied. The negative MR ratio is observed to be 24.6 % on [Fe(12 nm)/Tb(15 nm)]25 at 4.2 K, which is much larger than that of Tb monolayer film, 9.9 %. Such large MR has never reported in multilayer systems including rare earth metal. Assuming that the MR of Tb can also be explained by the AMR effect, it means that the MR effects of the Tb layer is enhanced by spin polarization of the Fe layers.

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Anomalous magnetic hysteresis of Gd and Fe moments in a Gd/Fe multilayer measured by hard x-ray magnetic circular dichroism

Cited by 38 publications

References 23 publications

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

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

The enhanced negative magnetoresistance of Fe/Tb multilayer at multiextreme conditions

The negative magnetoresistance of Fe/Tb magnetic multilayer

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