Study of exchange bias couping through spin-polarized quantum well
Date Issued
2003
Date
2003
Author(s)
Chuang, Cheng-Hao
DOI
zh-TW
Abstract
To realize the relation of quantum interference in the space layers between vacuum and Co/FeMn bilayers, it was observed by magneto-optic kerr effect (MOKE). FeMn alloy was first deposited on Cu(001) to serve as the antiferromagnetic substrate. Co layers were used as the ferromagnet to study
applications of exchange bias. Cu wedge was deposited on the top of Co/FeMn/Cu(001) by moving the substrate behind a knife-edge shutter.
The sample was prepared by molecular beam evaporation (MBE) method, deposited on Cu(001). Composition and film thickness were calibrated by oscillations of the medium energy electron diffraction (MEED), and cross checked by Auger electron spectroscopy (AES). All grown modes were accompanied by clear
intensity oscillations in medium energy electron diffraction , indicating Frank der Merve growth in a layer by layer fashion. On the other hand, low energy electron diffraction (LEED) and I/V LEED curves were used to measure film structure. The focus laser was used to measure magneto-optics Kerr effect (MOKE), which gives us excellent resolution of the thickness dependence.
We presented a systematic study of the exchange bias and coercivity as a function of the Cu layers thickness in the Cu(wedge)/Co/FeMn/Cu(001). The coercive field displayed five times than original magnitude, when Cu thickness overcomes approximate 3ML. When Cu thickness over 3ML, coercive field stayed about 280 Oe. Until Cu thickness over 5ML, coercive field
increased continuously. In the wide range, the oscillation of exchange bias in Cu/Co/FeMn/Cu(001) was 4-5ML.
Subjects
交換偏耦合
反鐵磁性
鐵磁性
磁光科爾效應
量子井
magnetic kerr effect
antiferromagnetic
exchange bias
quantum well
ferromagnetic
Type
thesis
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