• 제목/요약/키워드: spin torque

검색결과 122건 처리시간 0.043초

Switching current density for spin transfer torque magnetic random access memory with Dzaloshinskii-Moriya Interaction

  • Song, Kyungmi;Lee, Kyung-Jin
    • 한국자기학회:학술대회 개요집
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    • 한국자기학회 2015년도 임시총회 및 하계학술연구발표회
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    • pp.78-79
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    • 2015
  • We investigate the switching current for various cell diameters and DM interaction. We find that the current density for switching can depend strongly on the cell size when the switching is governed by the domain wall motion. Moreover the switching current density is also strongly influenced by DM interaction. In the presentation, we will discuss the effect of domain wall formation and more various DMI constant on the switching current desity in detail.

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퍼터의 라이각과 로프트각이 퍼팅한 공의 방향성에 미치는 영향 (Directional relationships of the golf ball with lie and loft angle of the putter)

  • 임형진
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2008년도 추계학술대회A
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    • pp.1496-1500
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    • 2008
  • Less than 1 % directional error in the range of 5 meters in the green could cause a stroke or more. Although there are several reasons offsetting the direction of the golf ball, lie angle and sidespin effect are the most crucial factors of the putting game. Simple equation is conformed to the experimental results of the deviation of the directional error in all distance. Also, the experimental results of the putting robot show that there are significant side spin effects.

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Spin Orbit Torque in Pd/FePd/MgO System

  • Lee, Hwang-Rae;Lee, Kyujoon;Cho, Jaehun;Choi, Young-Ha;You, Chun-Yeol;Jung, Myung-Hwa;Bonell, Frederic;Shiota, Yoichi;Miwa, Shinji;Suzuki, Yoshishige
    • 한국자기학회:학술대회 개요집
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    • 한국자기학회 2014년도 자성 및 자성재료 국제학술대회
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    • pp.21-21
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    • 2014
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제어 모멘트 자이로의 기술과 산업동향 (Technology of Control Moment Gyroscope and its Industrial Trend)

  • 이선호
    • 한국항공우주학회지
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    • 제40권1호
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    • pp.86-92
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    • 2012
  • 인공위성 자세제어에 널리 사용되는 구동기는 추력기, 반작용휠, 제어 모멘트 자이로(CMG), 그리고 자장토커 등이 있다. 그 중에서 CMG는 물리학의 자이로스코프 원리에 의한 토크를 발생시키는 구동기로서 적은 소모 전력으로 큰 토크를 출력하는 장점을 가지고 있다. 본 논문에서는 CMG 하드웨어 기술의 개요와 위성분야 적용 사례 및 관련된 하드웨어의 특성을 소개하며 더불어 선박, 로봇, MEMS 등 타 분야의 활용사례와 연구동향을 제공한다.

공중 물체의 자세 제어를 위한 자이로 엑츄에이터 설계 (Design of a Gyro Actuator for the Attitude Control of an Unstructured Object)

  • 정영구;이건영
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1998년도 하계학술대회 논문집 B
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    • pp.490-492
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    • 1998
  • An intention of this paper is design of a gyro actuator for the attitude control of an unstructured object. It is well known that the attitude control of an object hanging with wire is not easy using usual actuators. Even though an actuator such as a pan can be used for control of the object, it is difficult to meet a desired control objectives. We, for this reason, propose a gyro actuator for the attitude control of an unstructured object. The proposed gyro actuator consists of two motors. The first motor is responsible to spin the wheel and the second motor is used to turn the outer gimbal. Appling the torque to the second motor, which results in the turn of the outer gimbal, torque about the vertical axis will be obtained while a wheel of the gyro is spinning constantly. This torque is used to control the attitude of the object attached. The aim of this paper is of deriving the transfer function of the actuator and presenting the guideline of the design parameters such as the weight and the dimension of the wheel, motors, and the load capacity. Simulations to the mathematical model which has a state feedback control are conducted to show the validity of the proposed gyro actuator.

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