Magnetic Properties and Microstructure of FePt(B-Ag) Granular Films

• Main Authors: Jian-Chiang Huang, 黃健強
• Other Authors: Jai-Lin Tsai
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/86257270820886969747

碩士 === 國立中興大學 === 材料科學與工程學系所 === 100 === Multilayers Ag/[B(t)/FePt(1nm)]10 (thickness t = 0.05-0.6 nm) were alternately deposited on a glass substrate and subsequently annealed by rapid thermal process (RTP) at 800 oC for 3 min. After RTP, the interface between FePt and B inter-diffusion to form granular films. The (FePt)100-XBX granular films when B content added 5%,10% showed perpendicular magnetization. Compared to Ag/FePt bilayer, the average grain size of the L10 FePt decreased from 22.2 nm to 20.1,15.1nm and uniformly separated when the B content added 5%、10%. Then selected (FePt)90B10 and (FePt)95B5 granular films codeposited with different fraction of Ag, the BXAg1-X proportion from X=0 to X=1 .After RTP, formed the (FePt)90(BXAg1-X)10 and (FePt)95(BXAg1-X)5 granular films. Compared with (FePt)100-XBX granular films, the average grain sizes of (FePt)90(B0.7Ag0.3)10 and (FePt)95(B0.9Ag0.11)5 decreased to 10.8nm,6.6nm. All granular films showed perpendicular magnetization. Finally, selected (FePt)90B10 granular films codeposited with different fraction of Fe, the BXFe1-X proportion from X=0 to X=1.After RTP, formed the (FePt)90(BXFe1-X)10 granular films. From microstructure, the fraction of Fe increased , the granular films were changed to interaction-grains-structure. The hard-soft magnetic FePt-FeB grains are interacted and formed the aggregated FePt-FeB grains.