서지주요정보
마이크로마그네틱스 모델을 이용한 수평 자기 기록 매체의 노이즈 특성 해석 = Analysis of noise characteristics of longitudinal magneitc recording media by using micromagnetics model
서명 / 저자 마이크로마그네틱스 모델을 이용한 수평 자기 기록 매체의 노이즈 특성 해석 = Analysis of noise characteristics of longitudinal magneitc recording media by using micromagnetics model / 이경진.
저자명 이경진 ; Lee, Kyoung-Jin
발행사항 [대전 : 한국과학기술원, 1996].
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등록번호

8006785

소장위치/청구기호

학술문화관(문화관) 보존서고

MAME 96007

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초록정보

Noise characteristics of recording media become more important as the density of magnetic recording is ever increasing. In this thesis, recorded bit patterns and noise characteristics of longitudinal magnetic recording media have been studied by adopting numerical micromagnetic model. For this purpose, three different kinds of recording media is studied; a well-oriented film with an unique anisotropy constant, an isotropic film with an unique anisotropy constant and a well-oriented film with varying anisotropy constants of a gaussian distribution. For those three different media, no exchange coupling and weak exchange coupling assumption between grains are considered. Multiple bit patterns are simulated by head fields and magnetic properties of media are analyzed statistically. Magnetization pole densities in recorded bit are calculated as well as magnetization patterns. In the well-oriented film with an unique anisotropy constant and no exchange coupling case, it is found that the transition extends significantly to track edges, and this trend becomes more severe in the case of the medium of weak exchange coupled grains. There are shifts of transition position along the track edge and such shifts result in a broadening and shifting of read-back voltage. Magnetic moments in the track edge are in saturation magnetization states, which is expected to serve as a noise source of a cross talk type in the case of a narrow track recording. The noise within bit is concentrated at the transitions, namely transition noise. In the isotropic film with an unique anisotropy constant, the recorded transition does not extend to the recording track edge unlike the previous medium. When a bit is written in this medium some cells not within the head gap are also magnetically reversed by the head fields, unlike the previous medium. However, these patterns are expected to be erased easily as the cells are not in saturation magnetization states. Transition noise of this medium is lower than that of the previous medium but edge noise seems higher in this medium as the noise more widely. For the well-oriented film with varying anisotropy constants in gaussian distribution, a rectangular type bit with very small V-type patterns at bit edges is found and the medium noise is concentrated at the transitions.

서지기타정보

서지기타정보
청구기호 {MAME 96007
형태사항 [viii], 66 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Kyoung-Jin Lee
지도교수의 한글표기 : 이택동
지도교수의 영문표기 : Taek-Dong Lee
학위논문 학위논문(석사) - 한국과학기술원 : 신소재공학과,
서지주기 참고문헌 : p. 62-64
주제 자기 기록
마이크로마그네틱스
히스테리시스 모델링
Magnetic recording
Micromagnetics
Hysteresis modeling
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