Formation of FePt-MgO nanocomposites films at reduced temperature
學年 110
學期 2
出版(發表)日期 2022-05-26
作品名稱 Formation of FePt-MgO nanocomposites films at reduced temperature
著者 Da-Hua Wei*; Sheng-Chiang Chen; Cheng-Jie Yang; Rong-Tan Huang; Chung-Li Dong*; Yeong-Der Yao*
著錄名稱、卷期、頁數 Journal of Composites Science 6(6), 158
摘要 The MgO nanolayer effect on the microstructure and magnetic characterizations added into Fe/Pt stacked films directly deposited onto MgO (001) single-crystal substrates at the reduced temperature of 380 °C using electron-beam technology was investigated in this present work. The nanograin isolation and exchange decoupling for the FePt–MgO system is attributed to the magnetic FePt isolated grains that originate from MgO atoms with a spreading behavior mostly along grain boundaries owing to its weaker surface energy than that of a single Fe or Pt element. The grain and domain size decreased when the MgO nanolayer was applied due to the interpenetration of MgO and created a strain-energy variation at the MgO/FePt interface. Measuring angular-dependent coercivity indicates a general trend of a domain-wall motion, and changes to the rotation of the reverse-domain model occurred as the MgO nanolayers were added into FePt films. The intergrain interaction is confirmed by the Kelly–Henkel plot, which shows that there is strong intergrain exchange coupling (positive δM type) between neighboring grains in the continuous Fe/Pt stacked films without MgO nanolayers. In addition, a negative δM type occurred when the Fe/Pt stacked films were added into MgO nanolayers, showing that the MgO nanolayer can be applied to adjust the force of intergrain exchange coupling between the adjacent FePt nanograins, and the addition of MgO nanolayers change into magnetic decoupling; thus, there was a formed dipole interaction in our claimed FePt–MgO composite structure of stacked ultrathin films at a reduced temperature of 380 °C.
關鍵字 FePt nanocomposite;MgO nanolayer;stacked ultrathin films;magnetic decoupling/isolation;angular-dependent coercivity;Kelly–Henkel plot
語言 en
ISSN 2504-477X
期刊性質 國外
收錄於 ESCI
國別 CHE
出版型式 ,電子版

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