Exchange coupling in the correlated electronic states of amorphous GdFe films

H. J. Elmers; A. Chernenkaya; K. Medjanik; M. Emmel; G. Jakob; G. Schoenhense; D. Gottlob; I. Krug; F. M. F. de Groot; A. Gloskovskii

doi:10.1103/PhysRevB.88.174407

Exchange coupling in the correlated electronic states of amorphous GdFe films

H. J. Elmers^*, A. Chernenkaya, K. Medjanik, M. Emmel, G. Jakob, G. Schoenhense, D. Gottlob, I. Krug, F. M. F. de Groot, A. Gloskovskii

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

The bulk sensitivity of hard x-ray photoelectron spectroscopy in combination with circularly polarized radiation of the P09 beamline at PETRA III enables the investigation of the magnetic properties of capped films. We have determined the temperature dependence of the magnetic circular dichroism in the Fe 2p and in the Gd 3d states in amorphous GdFe films. The magnetic dichroism reflects the stronger temperature dependence of Gd moments compared to Fe moments in agreement with mean-field models. We resolved the exchange split Gd 3d(5/2) substates and found a significant temperature dependence of the splitting which is attributed to a temperature dependent part of the exchange energy caused by Stoner-like itinerant states. A comparison of experimental and simulated x-ray photoemission spectra with corresponding data for x-ray absorption spectroscopy exciting the identical core holes clearly demonstrates that the core hole exchange interaction is the origin of the observed multiplet features for Gd.

Original language	English
Article number	174407
Number of pages	10
Journal	Physical review. B, Condensed matter and materials physics
Volume	88
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevB.88.174407
Publication status	Published - 11 Nov 2013

Funding

The project is funded by the Stiftung Rheinland Pfalz fur Innovation (project 1038) and by the Centre for Complex Materials COMATT, Mainz. The HAXPES instrument at beamline P09 is jointly operated by the University of Wurzburg (R. Claessen), the University of Mainz (C. Felser), and DESY. We wish to thank W. Drube, J. Strempfer, and S. Francoual for support during the HAXPES measurements. Funding by the Federal Ministry of Education and Research (BMBF) under Contracts Nos. 05KS7UM1, 05K10UMA, 05KS7WW3, and 05K10WW1 is gratefully acknowledged. We acknowledge the Helmholtz-Zentrum Berlin for provision of synchrotron radiation beamtime at beamline UE56/1-SGM of BESSY II and would like to thank S. Cramm for assistance.

Keywords

CORE-LEVEL PHOTOEMISSION
X-RAY DICHROISM
LOCALIZED MAGNETIC SYSTEMS
TRANSITION-METAL ALLOYS
CIRCULAR-DICHROISM
PHOTOELECTRON-SPECTROSCOPY
SPIN POLARIZATION
VALENCE STATES
MAGNETOOPTICAL PROPERTIES
ANGULAR-DISTRIBUTION

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title = "Exchange coupling in the correlated electronic states of amorphous GdFe films",

abstract = "The bulk sensitivity of hard x-ray photoelectron spectroscopy in combination with circularly polarized radiation of the P09 beamline at PETRA III enables the investigation of the magnetic properties of capped films. We have determined the temperature dependence of the magnetic circular dichroism in the Fe 2p and in the Gd 3d states in amorphous GdFe films. The magnetic dichroism reflects the stronger temperature dependence of Gd moments compared to Fe moments in agreement with mean-field models. We resolved the exchange split Gd 3d(5/2) substates and found a significant temperature dependence of the splitting which is attributed to a temperature dependent part of the exchange energy caused by Stoner-like itinerant states. A comparison of experimental and simulated x-ray photoemission spectra with corresponding data for x-ray absorption spectroscopy exciting the identical core holes clearly demonstrates that the core hole exchange interaction is the origin of the observed multiplet features for Gd.",

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author = "Elmers, \{H. J.\} and A. Chernenkaya and K. Medjanik and M. Emmel and G. Jakob and G. Schoenhense and D. Gottlob and I. Krug and \{de Groot\}, \{F. M. F.\} and A. Gloskovskii",

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doi = "10.1103/PhysRevB.88.174407",

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AU - Elmers, H. J.

AU - Chernenkaya, A.

AU - Medjanik, K.

AU - Emmel, M.

AU - Jakob, G.

AU - Schoenhense, G.

AU - Gottlob, D.

AU - Krug, I.

AU - de Groot, F. M. F.

AU - Gloskovskii, A.

PY - 2013/11/11

Y1 - 2013/11/11

N2 - The bulk sensitivity of hard x-ray photoelectron spectroscopy in combination with circularly polarized radiation of the P09 beamline at PETRA III enables the investigation of the magnetic properties of capped films. We have determined the temperature dependence of the magnetic circular dichroism in the Fe 2p and in the Gd 3d states in amorphous GdFe films. The magnetic dichroism reflects the stronger temperature dependence of Gd moments compared to Fe moments in agreement with mean-field models. We resolved the exchange split Gd 3d(5/2) substates and found a significant temperature dependence of the splitting which is attributed to a temperature dependent part of the exchange energy caused by Stoner-like itinerant states. A comparison of experimental and simulated x-ray photoemission spectra with corresponding data for x-ray absorption spectroscopy exciting the identical core holes clearly demonstrates that the core hole exchange interaction is the origin of the observed multiplet features for Gd.

AB - The bulk sensitivity of hard x-ray photoelectron spectroscopy in combination with circularly polarized radiation of the P09 beamline at PETRA III enables the investigation of the magnetic properties of capped films. We have determined the temperature dependence of the magnetic circular dichroism in the Fe 2p and in the Gd 3d states in amorphous GdFe films. The magnetic dichroism reflects the stronger temperature dependence of Gd moments compared to Fe moments in agreement with mean-field models. We resolved the exchange split Gd 3d(5/2) substates and found a significant temperature dependence of the splitting which is attributed to a temperature dependent part of the exchange energy caused by Stoner-like itinerant states. A comparison of experimental and simulated x-ray photoemission spectra with corresponding data for x-ray absorption spectroscopy exciting the identical core holes clearly demonstrates that the core hole exchange interaction is the origin of the observed multiplet features for Gd.

KW - CORE-LEVEL PHOTOEMISSION

KW - X-RAY DICHROISM

KW - LOCALIZED MAGNETIC SYSTEMS

KW - TRANSITION-METAL ALLOYS

KW - CIRCULAR-DICHROISM

KW - PHOTOELECTRON-SPECTROSCOPY

KW - SPIN POLARIZATION

KW - VALENCE STATES

KW - MAGNETOOPTICAL PROPERTIES

KW - ANGULAR-DISTRIBUTION

U2 - 10.1103/PhysRevB.88.174407

DO - 10.1103/PhysRevB.88.174407

M3 - Article

SN - 1098-0121

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JO - Physical review. B, Condensed matter and materials physics

JF - Physical review. B, Condensed matter and materials physics

IS - 17

M1 - 174407

ER -

Exchange coupling in the correlated electronic states of amorphous GdFe films

Abstract

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Keywords

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