Journal Article

FZJ-2015-03472

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Chemical and magnetic profile of magnetic semiconductors as probed by polarized neutron reflectivity

Paul, A. (Corresponding Author) ; Mattauch, S.FZJ*

2010
IOP Publ. Bristol

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Please use a persistent id in citations: doi:10.1088/0022-3727/43/18/185002

Abstract: We investigate the depth dependence of magnetic species in co-doped dilute magnetic semiconductor (DMS) specimens. We also compare the reliability of the nuclear and magnetization depth profile of these specimens on different polarized neutron reflectivity instruments. These reflectometers were not only angle dispersive instruments but also wavelength dispersive instruments. Measurements indicate a segregation of DMS species onto the top into the cap layer for lower Fe doping. However, for higher Fe doping, as we alter the doping concentrations of magnetic species, no segregation and lower clustering tendencies are indicated. Thus sensitive depth profiling, for specimens with such low magnetic-ion concentrations, may not be a challenge for brighter sources and careful measurements. Our results show that homogeneity can be achieved with Fe co-doping within a Ge matrix which can make it a potential candidate for spintronic applications.

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Contributing Institute(s):

1. Streumethoden (JCNS-2)
2. Streumethoden (PGI-4)
3. JARA-FIT (JARA-FIT)
4. JCNS-FRM-II (JCNS (München) ; Jülich Centre for Neutron Science JCNS (München) ; JCNS-FRM-II)

Research Program(s):

1. 422 - Spin-based and quantum information (POF2-422) (POF2-422)
2. 424 - Exploratory materials and phenomena (POF2-424) (POF2-424)
3. 542 - Neutrons (POF2-542) (POF2-542)
4. 544 - In-house Research with PNI (POF2-544) (POF2-544)
5. 54G - JCNS (POF2-54G24) (POF2-54G24)

Experiment(s):

1. MARIA: Magnetic reflectometer with high incident angle (NL5N)
2. TREFF: Neutronenreflektometer (NL5S)

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Database coverage:
; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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