Jamie Thompson

University of Salford

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Tiehan H. Shen

North China University of Science and Technology Affiliated Hospital

Simon A. Morton

Glasgow Royal Infirmary

James Tobin

University of Wisconsin–Oshkosh

James R. Neal

Film Independent

Wuxia Li

NXP (Germany)

Elke Arenholz

Institute of Electrical and Electronics Engineers

G. D. Waddill

Missouri University of Science and Technology

M. Ellerby

London Centre for Nanotechnology

G. Dan Waddill

Missouri University of Science and Technology

Jun Zhang

Shenyang University

Cooperative Institutions

Lawrence Livermore National Laboratory

Missouri University of Science and Technology

Engineering and Physical Sciences Research Council

University of Sheffield

University of Leeds

Office of Scientific and Technical Information

Lawrence Berkeley National Laboratory

University of Salford

National Technical Information Service

Lawrence Livermore National Security

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Highly polarized emission in spin resolved photoelectron spectroscopy of α-Fe(001)/GaAs(001)

Surface Science (2010)

James Tobin S.-W. Yu Simon A. Morton G. D. Waddill Jamie Thompson

10.1016/j.susc.2010.04.024

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The evolution of Ga and As core levels in the formation of Fe∕GaAs (001): A high resolution soft x-ray photoelectron spectroscopic study

Journal of Applied Physics (2008)

Jamie Thompson James R. Neal Tiehan H. Shen Simon A. Morton James Tobin

A high resolution soft x-ray photoelectron spectroscopic study of Ga and As 3d core levels has been conducted for Fe∕GaAs (001) as a function of Fe thickness. This work has provided unambiguous evidence of substrate disrupting chemical reactions induced by the Fe overlayer—a quantitative analysis of the acquired spectra indicates significantly differing behavior of Ga and As during Fe growth, and our observations have been compared with existing theoretical models. Our results demonstrate that the outdiffusing Ga and As remain largely confined to the interface region, forming a thin intermixed layer. Whereas at low coverages Fe has little influence on the underlying GaAs substrate, the onset of substrate disruption when the Fe thickness reaches 3.5Å results in major changes in the energy distribution curves (EDCs) of both As and Ga 3d cores. Our quantitative analysis suggests the presence of two additional As environments of metallic character: one bound to the interfacial region and another which, as confirmed by in situ oxidation experiments, surface segregates and persists over a wide range of overlayer thickness. Analysis of the corresponding Ga 3d EDCs found not two, but three additional environments—also metallic in nature. Two of the three are interface resident whereas the third undergoes outdiffusion at low Fe coverages. Based on the variations of the integrated intensities of each component, we present a schematic of the proposed chemical makeup of the Fe∕GaAs (001) system.

Overlayer

Soft X-rays

10.1063/1.2942395

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Ferromagnetic metal / GaAs hybrid structures

Jamie Thompson

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Magnetic circular dichroism in Co1−xPtx nanowire bundles at the Co L2,3 edges

Applied Physics Letters (2007)

Wuxia Li Jun Zhang Jamie Thompson Tiehan H. Shen Elke Arenholz

Co 1 − x Pt x nanowire arrays embedded in anodic aluminum oxide templates were fabricated by an electrochemical route. X-ray magnetic circular dichroism (XMCD) measurements were conducted at the Co L2,3 edges on samples with an array of nanowire bundles at the substrate surfaces. The ratios between the orbital and the spin moments R were estimated to be about 0.19 (±0.03) and 0.07 (±0.03) for 20nm Co and 14nm Co91Pt9 nanowires, respectively. A strong temperature dependence of the R value was observed. The x-ray absorption spectra also indicated the presence of CoO, which did not contribute to the XMCD signals.

10.1063/1.2784186

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Magnetic circular dichroism in Co[sub 1−x]Pt[sub x] nanowire bundles at the Co L[sub 2,3] edges

Wuxia Li Jun Zhang Jamie Thompson Tiehan H. Shen Elke Arenholz

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Order from Chaos: (alpha)-Fe(001) Growth on GaAs(001)

OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (2008)

James Tobin Shizhe Yu S A Morton G. D. Waddill Jamie Thompson

The growth of Fe upon GaAs(001) has been studied with Spin-Resolved Photoelectron Spectroscopy (SRPES), Photoelectron Spectroscopy (PES) and X-ray Magnetic Linear Dichroism (XMLD) in PES. Despite evidence of atomic level disorder such as intermixing, an over-layer with the spectroscopic signature of {alpha}-Fe(001), with a bcc real space ordering, is obtained. The results will be discussed in light of the possibility of using such films as a spin polarized source in device applications.

Alpha (finance)

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