Magnetic and magneto-optical properties of the Tb(Mn₁[subscript x]Fe[subscript x])₂ system with x = 0.35, 0.5, 0.65

dc.contributor.author Zhang, Wei
dc.contributor.department Materials Science and Engineering
dc.date 2018-08-22T19:09:53.000
dc.date.accessioned 2020-06-30T08:00:50Z
dc.date.available 2020-06-30T08:00:50Z
dc.date.copyright Mon Jan 01 00:00:00 UTC 2001
dc.date.issued 2001-01-01
dc.description.abstract <p>The temperature (4.5-700 K) and magnetic field (0-50 kOe) dependencies of the dc magnetization, and ac magnetic susceptibility in 5 Oe, 125 Hz ac field of polycrystalline Tb(Mn[Subscript l-x]Fe[Subscript x])₂ alloys with x = 0.35, 0.5, and 0.65 have been measured. The substitution of Fe for Mn introduces a negative chemical pressure in the cubic C-15 crystal structure, decreasing the lattice parameters and the distance between Mn atoms below the critical value of 2.66 Ã Â . At 5 K, all studied Tb(Mn[Subscript l-x]Fe[Subscript x])₂ alloys exhibit ferrimagnetism which is created by the antiparallel alignment of the magnetic moments of Tb and Fe atoms. The Curie temperature, the remanence and coercivity increase with x increasing. For all alloys a change of the slope of the plot of the inverse dc magnetic susceptibility vs. temperature was observed, and the corresponding temperature increases with increasing x, i.e. with decreasing lattice parameters. The temperature dependence of the ac magnetic susceptibility of all of the Tb(Mn[Subscript l-x]Fe[Subscript x])₂ alloys exhibits a peak at Curie temperature which is typically observed for ferromagnetic materials with non-zero coercivity and remanence. For polycrystal samples, the diagonal optical conductivity ([Sigma subscript lxx]) has been measured using ellipsometry at zero magnetic field. The magneto-optical Kerr rotation angle and ellipticity have been measured by Kerr spectrometry at room temperature and a magnetic field of 5 kOe, the results show that Tb(Mn₀₅̣Fe₀₅̣)₂ and Tb(Mn₀₃̣₅Fe₀₆̣₅)₂ have larger Kerr rotational angle than TbFe₂ at room temperature. The magneto-optical measurements verified the conclusion that spin-orbit interaction and exchange splitting of the electronic structure are the dominant factors which determine the magneto-optical properties of the R-TM system.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/rtd/17544/
dc.identifier.articleid 18544
dc.identifier.contextkey 12466938
dc.identifier.doi https://doi.org/10.31274/rtd-180813-8326
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/17544
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/71369
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/rtd/17544/Zhang_ISU_2001_Z46.pdf|||Fri Jan 14 21:25:14 UTC 2022
dc.subject.disciplines Materials Science and Engineering
dc.subject.keywords Materials Science and Engineering
dc.title Magnetic and magneto-optical properties of the Tb(Mn₁[subscript x]Fe[subscript x])₂ system with x = 0.35, 0.5, 0.65
dc.type article
dc.type.genre thesis
dspace.entity.type Publication
relation.isOrgUnitOfPublication bf9f7e3e-25bd-44d3-b49c-ed98372dee5e
thesis.degree.discipline Materials Science and Engineering
thesis.degree.level thesis
thesis.degree.name Master of Science
File
Original bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
Zhang_ISU_2001_Z46.pdf
Size:
1.75 MB
Format:
Adobe Portable Document Format
Description: