Magnetization Dynamics and Thermal Stability in Nanostructured Magnetic Thin Films
- 주제(키워드) MRAM , magnetic thin film , magnetization dynamics , thermal stability
- 발행기관 고려대학교 대학원
- 지도교수 임상호
- 발행년도 2013
- 학위수여년월 2013. 2
- 학위구분 박사
- 학과 일반대학원 신소재공학과
- 원문페이지 139 p
- 실제URI http://www.dcollection.net/handler/korea/000000039475
- 본문언어 영어
- 제출원본 000045745907
초록/요약
The thesis is concerned with the magnetization dynamics and the thermal stability in nanostructured magnetic thin films, which are the key characteristics for advanced magnetic information storage applications. Two kinds of thin films, nanostructured single magnetic layers and nanostructured synthetic ferrimagnets are considered. The key to the investigation is the accurate description on the total magnetic energy in the nanostructured magnets. Armed with an accurate total energy equation, the magnetization dynamics and the thermal stability are studied by using the combined method of the analytical calculation based on the total energy equation and the numerical calculation using the micromagnetic simulation. Two structures of nanostructured single magnetic layers and nanostructured synthetic ferrimagnets are considered in studying the magnetization dynamics. For the single magnetic layers, the various dynamic magnetization switching behaviors under external magnetic field are investigated. The criteria for the various dynamic switching behaviors are given in a single analytical phase diagram with clear explanations. In the synthetic ferrimagnets, the suppression of the precessional motion of magnetization is investigated, which is one of the obvious ways to reduce the switching time. The thermally activated magnetization switching and the dynamic switching windows are also investigated. The thermal stability is studied in nanostructured synthetic ferrimagnets. Various values of the thickness asymmetry between two magnetic layers are considered to find correlation between the structure and the thermal stability.
more목차
Introduction
Phase diagram of magnetization switching in a nanostructured magnetic thin film
An alternate switching/non-switching behavior of a nanostructured magnetic thin film under sub-Stoner-Wohlfarth switching fields
Effect of the transverse bias field on the dynamic magnetization switching behavior
Suppression of the precessional motion of magnetization in a nanostructured synthetic ferrimagnet
Thermally activated magnetization switching in a nanostructured synthetic ferrimagnet
Switching windows for a nanostructured cell of synthetic ferrimagnets
Thermal stability and critical switching field of nanostructured synthetic ferrimagnets
Conclusions
Thermal stability of a nanostructured exchange-coupled trilayer
Curriculum Vitae
