Electric-field gradients in thin face-centered-tetragonal Co films observed by nuclear magnetic resonance

Wieldraaijer, H Harm; Jonge, de Wjm Wim

doi:10.1103/physrevb.72.155409

Cited by 17 publications

(21 citation statements)

References 38 publications

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“…Taking into account an ideal coherent growth of Co on Cu͑001͒, this results in an axial ratio of c / a = 0.957, in excellent agreement with earlier independent studies using other methods. 12 For Mn ͓series ͑2͔͒ we get c =2d Ќ = 3.77 Å, or alternatively an axial ratio of c / a = 1.043, thus fct growth with an expanded c axis ͑e-fct͒. This c / a ratio is independent of both the Mn and the Co thicknesses used, indicating a metastable e-fct phase.…”

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confidence: 88%

Exchange anisotropy as a probe of antiferromagnetism in expanded face-centered-tetragonal Mn(001) layers

Wieldraaijer

Jonge

2006

Applied Physics Letters

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Manganese (Mn) grows coherent and with an expanded metastable face-centered-tetragonal (e-fct) structure on ultrathin fct Co(001)∕Cu(001) template layers. From the temperature dependence of the observed unidirectional Mn∕Co interface exchange anisotropy, an antiferromagnetic state with a blocking temperature around 410K is found for a 21 monolayer thick e-fct Mn(001) film. The temperature dependent coercivity enhancement of the Co films, which is induced by the proximity of the antiferromagnetic Mn layer, suggests a Néel temperature above 410K for this Mn phase.

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confidence: 88%

Exchange anisotropy as a probe of antiferromagnetism in expanded face-centered-tetragonal Mn(001) layers

Wieldraaijer

Jonge

2006

Applied Physics Letters

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“…Spin echo nuclear magnetic resonance ͑NMR͒ measurements are able to probe the direct local environments of the active atoms and are thus able to resolve next neighboring shells. [5][6][7] Thus this method provides a tool to reveal the random distribution of Mn and Fe in Co 2 Mn 1−x Fe x Si. NMR measurements provide a tool to obtain the local environment by measuring the resonance frequencies and consequently probing the local hyperfine magnetic fields, revealing the first few next neighboring shells of the active atoms.…”

Section: 2mentioning

confidence: 99%

Probing the random distribution of half-metallic Co2Mn1−xFexSi Heusler alloys

Wurmehl

Swagten

Koopmans

et al. 2007

Applied Physics Letters

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“…[4][5][6][7] Thus, this method provides a unique tool to reveal the random distribution of Mn and Fe in Co 2 Mn 1−x Fe x Si.…”

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confidence: 99%

Effects of random distribution of Mn,Fe in Co2Mn1−xFexSi Heusler compounds probed by Mn55 nuclear magnetic resonance

Wurmehl

Swagten

Koopmans

et al. 2008

Journal of Applied Physics

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Document VersionPublisher's PDF, also known as Version of Record (includes final page, issue and volume numbers)Please check the document version of this publication:• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication Citation for published version (APA):Wurmehl, S., Kohlhepp, J. T., Swagten, H. J. M., Koopmans, B., Wójcik, M., Balke, B., ... Felser, C. (2008). Effects of random distribution of Mn,Fe in Co2Mn1-xFexSi Heusler compounds probed by 55Mn nuclear magnetic resonance. Journal of Applied Physics, 103(7), 07D706-1/3. [07D706]. DOI: 10.1063/1.2831359 General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Recent spin echo nuclear magnetic resonance ͑NMR͒ revealed that the half-metallic Co 2 Mn 1−x Fe x Si Heusler alloys exhibit the L2 1 structure with random distribution of Mn and Fe on the 4b Wyckoff position. This random distribution is most prominent in the third coordination shell of the 55 Mn nuclei, as this shell is the first magnetically active shell, leading to a line splitting in the 55 Mn NMR spectra. A comparison, as presented in this paper, of all 55 Mn NMR satellite lines shows that the resonance frequencies corresponding to the same number of Fe atoms in the third shell of 55 Mn shift to slightly different resonance frequencies with increasing overall Fe content x. This shift is related to the constructive contribution of higher shells to the hyperfine field. These higher shells affect also the satellite linewidth, leading to a parabolic behavior with increasing Fe concentration x. This parabolic behavior is modified by the frequency spacing related to the replacement of Mn by Fe.

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Electric-field gradients in thin face-centered-tetragonal Co films observed by nuclear magnetic resonance

Cited by 17 publications

References 38 publications

Exchange anisotropy as a probe of antiferromagnetism in expanded face-centered-tetragonal Mn(001) layers

Exchange anisotropy as a probe of antiferromagnetism in expanded face-centered-tetragonal Mn(001) layers

Probing the random distribution of half-metallic Co2Mn1−xFexSi Heusler alloys

Effects of random distribution of Mn,Fe in Co2Mn1−xFexSi Heusler compounds probed by Mn55 nuclear magnetic resonance

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