Nghiên cứu cơ chế trao đổi dịch vuông góc trong hệ màng mỏng đa lớp MnPd/Co (STUDY OF PERPENDICULAR EXCHANGE BIAS MECHANISM IN MnPd/Co MULTILAYERS)

The multilayers of [MnPd/Co]10 have been investigated for the first time. The results indicate that large perpendicular exchange bias field and magnetic anisotropy were found in these samples below the blocking temperature TB ~ 240 K. The dependence of exchange bias on the layer thickness has also been studied. The easy axis direction strongly depends on both the Co and MnPd thicknesses. The origin of the perpendicular anisotropy was attributed to the magneto-elastic effect due to the strained CoPd interfacial alloy forming at the interface between the Co and MnPd layers. In order to explain the perpendicular exchange bias mechanism, a phenomenological picture was put forward in which the fluctuations of the MnPd spins at the interface play an important role. Besides, the results show the anomalous effect related to field-induced anisotropy, i.e. the parallel field cooling enhanced the perpendicular anisotropy property instead of the perpendicular one.

Tài liệu đưa ra những nghiên cứu hệ màng mỏng đa lớp [MnPd/Co]10. Kết quả cho thấy độ lớn trường trao đổi dịch và năng lượng dị hướng từ vuông góc lớn đã thu được ở dưới nhiệt độ blocking TB ~ 240 K.. Nội dung bằng tiếng Anh.
Chapter 1 Introduction
Chapter 2 Experimental
Chapter 3 Experimental results
Chapter 4 Discussions
Conclusions and further direction

Người hướng dẫn: GS. TSKH. Nguyễn Phú Thùy
Người phản biện:
1. TS. Nguyễn Thăng Long
2. TS. Nguyễn Phúc Dương

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The multilayers of [MnPd/Co]10 have been investigated for the first time. The results indicate that large perpendicular exchange bias field and magnetic anisotropy were found in these samples below the blocking temperature TB ~ 240 K. The dependence of exchange bias on the layer thickness has also been studied. The easy axis direction strongly depends on both the Co and MnPd thicknesses. The origin of the perpendicular anisotropy was attributed to the magneto-elastic effect due to the strained CoPd interfacial alloy forming at the interface between the Co and MnPd layers. In order to explain the perpendicular exchange bias mechanism, a phenomenological picture was put forward in which the fluctuations of the MnPd spins at the interface play an important role. Besides, the results show the anomalous effect related to field-induced anisotropy, i.e. the parallel field cooling enhanced the perpendicular anisotropy property instead of the perpendicular one.

Tài liệu đưa ra những nghiên cứu hệ màng mỏng đa lớp [MnPd/Co]10. Kết quả cho thấy độ lớn trường trao đổi dịch và năng lượng dị hướng từ vuông góc lớn đã thu được ở dưới nhiệt độ blocking TB ~ 240 K.. Nội dung bằng tiếng Anh.
Chapter 1 Introduction
Chapter 2 Experimental
Chapter 3 Experimental results
Chapter 4 Discussions
Conclusions and further direction

Người hướng dẫn: GS. TSKH. Nguyễn Phú Thùy
Người phản biện:
1. TS. Nguyễn Thăng Long
2. TS. Nguyễn Phúc Dương

LINK DOWNLOAD

Chuyên mục: D. Luận văn D. Luận văn chuyên ngành Nhiệt Lạnh (Heat and Refrigeration) D. Luận văn kỹ thuật