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Magnetic and Electronic Properties of Fe0.1Sc0.9N/ScN(001)/MgO(001) Films Grown by Radio-Frequency Molecular Beam Epitaxy

Published online by Cambridge University Press:  31 January 2011

Costel Constantin ,
Kangkang Wang ,
Abhijit Chinchore ,
Han-Jong Chia ,
John Markert  and
Arthur R Smith
Costel Constantin
Affiliation:
constaco@shu.edu, Seton Hall University, South Orange, New Jersey, United States
Kangkang Wang
Affiliation:
kw136705@ohio.edu, Ohio University, Physics and Astronomy, Ohio University, Athens, Ohio, 45701, United States, 740-274-1061
Abhijit Chinchore
Affiliation:
ac904605@ohio.edu, Ohio University, Physics And Astronomy, Athens, Ohio, United States
Han-Jong Chia
Affiliation:
chia@physics.utexas.edu, University of Texas at Austin, Department of Physics, Austin, Texas, United States
John Markert
Affiliation:
markert@physics.utexas.edu, University of Texas at Austin, Department of Physics, Austin, Texas, United States
Arthur R Smith
Affiliation:
asmith@helios.phy.ohiou.edu, Ohio University, Physics and Astronomy, Ohio University, Athens, Ohio, 45701, United States, 740-274-1061
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Abstract

Fe0.1Sc0.9N with a thickness of ˜ 380 nm was grown on top of a ScN(001) buffer layer of ˜ 50 nm, grown on MgO(001) substrate by radio-frequency N-plasma molecular beam epitaxy (rf-MBE). The buffer layer was grown at TS ˜ 800 oC, whereas the Fe0.1Sc0.9N film was grown at TS ˜ 420 oC. In-situ reflection high-energy electron diffraction measurements show that the Fe0.1Sc0.9N film growth starts with a combination of spotty and streaky pattern [indicative of a combination of smooth and rough surface]. After ˜ 10 minutes of growth, the pattern converts to a spotty one [indicative of a rough surface]. Towards the end of the Fe0.1Sc0.9N film growth, the spotty patterns transform into even spottier, but also ring-like indicating a polycrystalline behavior. Superconducting quantum interference device magnetic measurements show a ferromagnetic to paramagnetic transition of TC ˜ 370 – 380 K. We calculated a magnetic moment per atom of μ(Fe0.1Sc0.9N) = 0.037 Bohr magneton/ Mn-atom. Based on the carrier concentration measurements (nS(Fe0.1Sc0.9N) = 2.086 × 1019 /cm3), we find that iron behaves as an acceptor. Comparisons are made with similar MnScN (001)/ScN(001)/MgO(001) system.

Keywords

molecular beam epitaxy (MBE)spintronicmagnetic properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1198: Symposium E – Advanced Materials for Half-Metallic and Organic Spintronics , 2009 , 1198-E07-22
Copyright
Copyright © Materials Research Society 2010

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