Magnetic Properties and Structure of Low Temperature Phase MnBi with Island Structure

Show simple item record Mankey, Gary 2019-07-22T18:54:03Z 2019-07-22T18:54:03Z 2017-02-22 en_US
dc.identifier.citation Ito, M., et al. (2017): Magnetic Properties and Structure of Low Temperature Phase MnBi with Island Structure. AIP Advances, 7(5). DOI: en_US
dc.description.abstract The magnetic properties of the low temperature 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 ∼ 40. Their size vary from place to place, but are averagely of about a few hundred nm in height and a few μm 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 μm. The coverage of those islands increases with N. The temperature dependence of saturation magnetization M_s is qualitatively similar to that for bulk, though the absolute values for M_s are smaller by 20%. The magnetic anisotropy constants of K_u1 and K_u2 are evaluated for the samples with N=10 ∼ 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 1x10⁷ 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 10⁶ 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. en_US
dc.format.mimetype application/pdf en_US
dc.language English en_US
dc.subject Optical imaging en_US
dc.subject Oxides en_US
dc.subject Fourier analysis en_US
dc.subject Crystal lattices en_US
dc.subject Electron diffraction en_US
dc.subject X-ray diffraction en_US
dc.subject Thin films en_US
dc.subject Amorphous materials en_US
dc.subject Magnetic anisotropy en_US
dc.subject Magnetic properties en_US
dc.title Magnetic Properties and Structure of Low Temperature Phase MnBi with Island Structure en_US
dc.type text en_US

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