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Magnetic properties and structure of low temperature phase MnBi with island structure

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dc.contributor.authorIto, Masashi
dc.contributor.authorTanaka, Yoshitomo
dc.contributor.authorSatoh, Takuya
dc.contributor.authorMankey, Gary
dc.contributor.authorSchad, Rainer
dc.contributor.authorSuzuki, Takao
dc.contributor.otherUniversity of Alabama Tuscaloosa
dc.contributor.otherTDK Corporation
dc.date.accessioned2019-07-22T18:54:03Z
dc.date.available2019-07-22T18:54:03Z
dc.date.issued2017-02-22
dc.description.abstractThe magnetic properties of the lowtemperature phase (LTP) MnBi thin films of islands structure are discussed. The LTP MnBi islands are formed onto silica substrates after the multilayers {Bi(3.2nm)/Mn(2nm)}x N are deposited and then annealed at 450C for 0.5hr, where N is the number of the repetition of a pair of Mn and Bi layer. Those islands are found to be of the LTP MnBi, with the c-axis orientation along the normal to the sample plane for N= 10 similar to 40. Their size vary from place to place, but are averagely of about a few hundred nm in height and a few mu m in width for N from 10 to 40. For N= 200, the elongated islands are formed densely, with the length of about a few tens of mu m. The coverage of those islands increases with N. The temperature dependence of saturation magnetization Ms is qualitatively similar to that for bulk, though the absolute values for Ms are smaller by 20%. The magnetic anisotropy constants of K-u1 and K-u2 are evaluated for the samples with N= 10 similar to 40, where K-u1 and K-u2 are the magnetic anisotropy constants corresponding to the second and fourth power term in the uniaxial magnetic anisotropy energy expression. It is found that the K-u1 increases with T monotonously, reaching to about 1x10(7) erg/cc at 400K. On the other hand, the K-u2 remains nearly zero for temperatures below 300K, and then becomes negative, reaching to about 7 x 10(6) erg/cc at 400K. This is the first to report of the temperature dependence of K-u1 and K-u2 in the LTP MnBi of an island structure. It is also noted that the decrease of K-u for a temperature range beyond around 450 K is possibly due to the decrease of the K-u2 component, as demonstrated in the present study. (C) 2017 Author(s).en_US
dc.format.mimetypeapplication/pdf
dc.identifier.citationIto, M., et al. (2017): Magnetic Properties and Structure of Low Temperature Phase MnBi with Island Structure. AIP Advances, 7(5). DOI: https://doi.org/10.1063/1.4977230
dc.identifier.doi10.1063/1.4977230
dc.identifier.orcidhttps://orcid.org/0000-0003-3163-5159
dc.identifier.urihttp://ir.ua.edu/handle/123456789/6009
dc.languageEnglish
dc.language.isoen_US
dc.publisherAmerican Institute of Physics
dc.subjectELECTRONIC-STRUCTURE
dc.subjectNanoscience & Nanotechnology
dc.subjectMaterials Science, Multidisciplinary
dc.subjectPhysics, Applied
dc.subjectScience & Technology - Other Topics
dc.subjectMaterials Science
dc.subjectPhysics
dc.titleMagnetic properties and structure of low temperature phase MnBi with island structureen_US
dc.typetext
dc.typeArticle
dc.typeProceedings Paper

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