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Magnetic order, aging, and spin frustration in a percolating spin system, LiNi0.8Co0.1Mn0.1O2
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
ECME, LP2E2M, FST Marrakech, University Cadi Ayyad.
ECME, LP2E2M, FST Marrakech, University Cadi Ayyad.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Structural Chemistry.
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2010 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 108, no 8, 083909- p.Article in journal (Refereed) Published
Abstract [en]

Structural and magnetic properties of the Li layered oxide, LiNi0.8Co0.1Mn0.1O2, have been studied by means of x-ray diffraction, dc magnetization, ac linear, and nonlinear susceptibility as well as by magnetic aging and temperature cycling experiments. A percolating spin system interacting via antiferromagnetic and ferromagnetic superexchange interactions of different strength induce a ferrimagnetic quasilong-range order with a transition temperature Tc ≈ 70 K, a Weiss temperature of −25 K and an effective magnetic moment of 2.07 μB. On cooling below Tc the two-dimensional (2D) triangular lattice built up of edge-sharing metal oxide octahedras first exhibits a 2D spin glass like behavior followed by complete spin frustration in three dimensions below 30 K. The findings correlate well with expectations for a ferrimagnetic reentrant cluster glass system as well as with predictions of the percolating cluster model.

Place, publisher, year, edition, pages
2010. Vol. 108, no 8, 083909- p.
Keyword [en]
ageing, cobalt compounds, ferrimagnetic materials, frustration, lithium compounds, long-range order, magnetic moments, magnetic susceptibility, magnetisation, manganese compounds, nickel compounds, superexchange interactions, X-ray diffraction
National Category
Physical Sciences Inorganic Chemistry Engineering and Technology
Research subject
Chemistry with specialization in Inorganic Chemistry; Engineering Science with specialization in Solid State Physics
URN: urn:nbn:se:uu:diva-133312DOI: 10.1063/1.3493243ISI: 000283745100090OAI: oai:DiVA.org:uu-133312DiVA: diva2:361003
Available from: 2010-11-06 Created: 2010-11-06 Last updated: 2014-12-10
In thesis
1. Fundamental Properties of Functional Magnetic Materials
Open this publication in new window or tab >>Fundamental Properties of Functional Magnetic Materials
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Magnetic properties of powders, thin films and single crystals have been investigated using magnetometry methods. This thesis provides analysis and conclusions that are supported by the results obtained from spectroscopic and diffraction measurements as well as from theoretical calculations.

First, the magnetic behavior of transition metal (TM) doped ZnO with respect to doping, growth conditions and post annealing has been studied. Our findings indicate that the magnetic behavior stems from small clusters or precipitates of the dopant, with ferromagnetic or antiferromagnetic interactions. At the lowest dopant concentrations, the estimated cluster sizes are too small for high resolution imaging. Still, the clusters may be sufficiently large to generate a finite spontaneous magnetization even at room temperature and could easily be misinterpreted as an intrinsic ferromagnetic state of the TM:ZnO compound.

Second, influence of lattice strain on both magnetic moment and anisotropy has been investigated for epitaxial MnAs thin films grown on GaAs substrates. The obtained magnetic moments and anisotropy values are higher than for bulk MnAs. The enhanced values are caused by highly strained local areas that have a stronger dependence on the in-plane axis strain than out-of plane axis strain.

Finally, spin glass behavior in Li-layered oxides, used for battery applications, and a double perovskite material has been investigated. For both Li(NiCoMn)O2 and (Sr,La)MnWO6, a mixed-valence of one of the transition metal ions creates competing ferromagnetic and antiferromagnetic interactions resulting in a low temperature three-dimensional (3D) spin glass state. Additionally, Li(NiCoMn)O2 with large cationic mixing exhibits a percolating ferrimagnetic spin order in the high temperature region and coexists with a two-dimensional (2D) frustrated spin state in the mid temperature region. This is one of the rare observations where a dimensional crossover from 2D to 3D spin frustration appears in a reentrant material.

Place, publisher, year, edition, pages
Uppsala: acta universitatis upsaliensis, 2010. 74 p.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 790
Magnetic anisotropy, magnetic aging, magnetic semiconductors, exchange interactions, magnetic oxides, spin glasses, lithium-ion batteries, short-range magnetic order
National Category
Physical Sciences
Research subject
Engineering Science with specialization in Solid State Physics
urn:nbn:se:uu:diva-133257 (URN)978-91-554-7953-4 (ISBN)
Public defence
2010-12-17, Polhemsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 09:15 (English)
Felaktigt tryckt som Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 720Available from: 2010-11-25 Created: 2010-11-04 Last updated: 2011-03-21Bibliographically approved

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Wikberg, J. MagnusGustafsson, TorbjörnEdström, KristinaSvedlindh, Peter
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