鐵超薄膜以及鐵氮薄膜結構與磁性研究

林盈志

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鐵超薄膜以及鐵氮薄膜結構與磁性研究

Magnetic and structural properties of bcc-Fe ultra thin film and iron nitride (FeNx) thin film

林盈志 , Ph.D　　Advisor：林敏聰　　

英文

體心鐵；體心錳；自旋軸翻轉；高飽和磁矩；鐵氮化合物；鐵磁反鐵磁耦合現象； X光電子能譜；電子結構混合；矯頑磁場操控； bcc-Fe ； spin reorientation transition ； bct-Mn ； exchange coupling ； Fe16N2 ； high saturation magnetization ； XPS ； electronic hybridization ； coercivity manipulation

Abstract │ Reference (161) │ Altmetrics

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Perpendicular magnetic anisotropy and giant saturation magnetization are both critical physical properties in fundamental science and contemporary industries.
Therefore they attract much attention in magnetic investigation. Iron(Fe) and its nitride are the candidates for the materials of perpendicular magnetic anisotropy and giant saturation magnetization. We devote to investigate these topics:

(1)The magnetic properties and crystalline structure of bcc-Fe on NiAl(001) 
(2) The exchange coupling between Fe/bct-Mn systems
(3) The electronic structure,magnetic properties and AFM-induced coercivity enhancement of FeN thin films.

Ultrathin Fe films were deposited on NiAl(001) for the studies of the magnetic properties and crystalline structures. Spin reorientation transition (SRT) was observed at approximately 4 monolayers (MLs) at room temperature. At less than this critical thickness, the Fe _lms's easy axis is perpendicular to the surface plane with a ultra small coercive field (Hc ~ 1 Oe) which is much smaller than other related Fe systems. Such soft perpendicular magnetization may cause to the special surface reconstruction and termination of NiAl(001). During the transition region, the Fe films sustained body-centered-cubic (bcc) structure without any obvious phase transformation and variation. Thus, through a phenomenological model, the competition between the surface anisotropy and shape anistropy determine the SRT behavior. The surface anisotropy is 267.3 μeV/atom, which smaller than the cases of bct-Fe on Ag(001) and free standing bcc-Fe. The weaker surface anisotropy might be attributed the reconstructed NiAl(001) surface.

Expanded bcc-Mn films ( c/a = 1.15) were deposited on NiAl(001) for the studies in the magnetic property. In the Fe/Mn bilayer system, the coercive field enhancement is observed when the Mn thickness is greater than 9 ML. Through AFM/FM exchange theory, the coercive field enhancement without exchange bias implies the coherent rotation between Mn and Fe layers during the magnetization process.
      
       Iron nitride, which exhibits a higher saturation magnetization than a bcc-Fe thin film, was grown on Au(001) texture on a GaAs(001) substrate for studies of crystalline structure, electronic structure and magnetic properties. Fe 2p3/2 and Fe 2p1/2 X-ray photoelectron spectra (XPS) reveal the electronic hybridization between the Fe atoms and the adjacent N atoms. Through the multipeak analysis, except main peak of Fe(4d), the remaining two peaks in the Fe 2p spectrum correspond to Fe(8h) and Fe(4e) geometrical sites and that they simultaneously show an energy shift toward higher energy which suggests the charge-transfer-induced electronic rearrangement of electronic configuration in Fe(8h) and Fe(4e) geometrical sites. These observations in electronic structure and hybridization between the N atoms and the adjacent Fe atoms could help to explain the saturation magnetization enhancement in the FeN system. On the other hand, the Cr thin film also was deposited on the FeN sample. AFM-induced coercive field enhancement is observed as the Cr thickness increases. These results provide a guide for the coercivity manipulation in the future.

Reference ( 161 ) 〈TOP〉

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[9] B. Y. Wang, N. Y. Jih, W. C. Lin, C. H. Chuang, P. J. Hsu, C. W. Peng, Y. C. Yeh, Y. L. Chan, D. H. Wei, W. C. Chiang, and Minn-Tsong Lin, Phys.Rev. B 83,104417(2011)
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