• 제목/요약/키워드: magnetic tunneling junction

검색결과 66건 처리시간 0.029초

비정질 n형 Si 박막을 이용한 자기터널링 트랜지스터 제작과 특성 (Fabrication and Characteristics of Magnetic Tunneling Transistors using the Amorphous n-Type Si Films)

  • 이상석;이진용;황도근
    • 한국전기전자재료학회논문지
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    • 제18권3호
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    • pp.276-283
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    • 2005
  • Magnetic tunneling transistor (MTT) device using the amorphous n-type Si semiconductor film for base and collector consisting of the [CoFe/NiFe](free layer) and Si(top layer) multilayers was used to study the spin-dependent hot electron magnetocurrent (MC) and tunneling magnetoresistance (TMR) at room temperature. A large MC of 40.2 % was observed at the emitter-base bias voltage ( $V_{EB}$ ) of 0.62 V. The increasing emitter hot current and transfer ratio ( $I_{C}$/ $I_{E}$) as $V_{EB}$ are mainly due to a rapid increase of the number of conduction band states in the Si collector. However, above the $V_{EB}$ of 0.62 V, the rapid decrease of MC was observed in amorphous Si-based MTT because of hot electron spin-dependent elastic scattering across CoFe/Si interfaces.

$SrTiO_3$ 장벽층을 이용한 경사형 모서리 접합의 터널링 자기저항 특성연구 (Tunneling Magnetoresistance of a Ramp Edge Junction with $SrTiO_3$ Barrier Layer)

  • Lee, Sang-Suk;Kim, Young-Il;Hwang, Do-Guwn;Kim, Sun-Wook;Kungwon Rhie;Rhee, Jang-Roh
    • 한국자기학회:학술대회 개요집
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    • 한국자기학회 2002년도 동계연구발표회 논문개요집
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    • pp.174-175
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    • 2002
  • A ramp-type tunneling magnetoresistance (TMR) junction having structure NiO(60 nm)/pinned Co(10 nm)MiO(60 nm)/barrier SrTiO$_3$(2-10 nm)/free NiFe(10 nm) with the 15 degree slope was investigated. We obtained nonlinear I(V) characteristics for ramp-type tunneling junctions that have distinctive difference with and without applied magnetic field. In the barrier SrTiO$_3$ thickness of 4 nm, the TMR was about 52% at a bias voltage of 50 mV. (omitted)

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Magnetic and Thermal Evaluation of a Magnetic Tunneling Junction Current Sensor Package

  • Rhod, Eduardo;Peter, Celso;Hasenkamp, Willyan;Grion, Agner
    • 마이크로전자및패키징학회지
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    • 제23권4호
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    • pp.49-55
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    • 2016
  • Nowadays there are magnetic sensors in a wide variety of equipment such as computers, cars, airplanes, medical and industrial instruments. In many of these applications the magnetic sensors offer safe and non-invasive means of detection and are more reliable than other technologies. The electric current in a conductor generates a magnetic field detected by this type of sensor. This work aims to define a package dedicated to an electrical current sensor using a MTJ (Magnetic Tunnel Junction) as a sensing device. Four different proposals of packaging, three variations of the chip on board (CoB) package type and one variation of the thin small outline package (TSOP) were analyzed by COMSOL modeling software by simulating a brad range of current injection. The results obtained from the thermal and magnetic analysis has proven to be very important for package improvements, specially for heat dissipation performance.

Variation-tolerant Non-volatile Ternary Content Addressable Memory with Magnetic Tunnel Junction

  • Cho, Dooho;Kim, Kyungmin;Yoo, Changsik
    • JSTS:Journal of Semiconductor Technology and Science
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    • 제17권3호
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    • pp.458-464
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    • 2017
  • A magnetic tunnel junction (MTJ) based ternary content addressable memory (TCAM) is proposed which provides non-volatility. A unit cell of the TCAM has two MTJ's and 4.875 transistors, which allows the realization of TCAM in a small area. The equivalent resistance of parallel connected multiple unit cells is compared with the equivalent resistance of parallel connected multiple reference resistance, which provides the averaging effect of the variations of device characteristics. This averaging effect renders the proposed TCAM to be variation-tolerant. Using 65-nm CMOS model parameters, the operation of the proposed TCAM has been evaluated including the Monte-Carlo simulated variations of the device characteristics, the supply voltage variation, and the temperature variation. With the tunneling magnetoresistance ratio (TMR) of 1.5 and all the variations being included, the error probability of the search operation is found to be smaller than 0.033-%.

Ti 첨가에 따른 Al 미세구조 변화 효과와 산화 TiAl 절연층을 갖는 자기터널접합의 자기저항 특성 (Effect of Ti Concentration on the Microstructure of Al and the Tunnel Magnetoresistance Behaviors of the Magnetic Tunnel Junction with a Ti-alloyed Al-oxide Barrier)

  • 송진오;이성래
    • 한국자기학회지
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    • 제15권6호
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    • pp.311-314
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    • 2005
  • 본 연구에서는 Al-Oxide(AIOx) 에 Ti를 첨가하여. Ti 함량에 따라 자기터널접합의 자기터널링 현상 변화 및 TiA l합금박막의 미세구조, 표면거칠기 변화를 관찰하였다. Ti를 첨가한 TiAlOx 절연층을 사용하여 기존 AlOx를 사용한 경우 보다 높은 터널링 자기저항(Tunneling Magnetoresistance, TMR) 비를 가지는 자기터널접합을 제작하였다. TMR 비의 증가 요인은 Ti를 첨가함에 따라, TiAl 합금박막의 입계가 작아지고, 치밀한 구조를 가져, 우수한 계면평활도를 가지는 균일한 TiAlOx 절연층이 형성되어, 소자의 구조적 안정성이 향상되었기 때문으로 분석하였다. 또한 향상된 구조적 안정성으로 인해 소자의 열적, 전기적 안정성도 크게 증가하였다.

Co/Pd 다층막구조가 수직자기터널접합의 자기저항에 미치는 영향 (Effect of Co/Pd Multilayer on the Magnetoresistance of Perpendicularly Magnetized Magnetic Tunnel Junction)

  • 김성동;임동원;이성래
    • 한국자기학회지
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    • 제16권6호
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    • pp.271-275
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    • 2006
  • Co/Pd 다층막을 이용한 수직자기터널접합에서 Co 전극 및 Co, Pd 다층막의 두께변화가 터널링 자기저항비에 미치는 영향에 대해 조사하였다. Co 전극의 경우 0.5nm 두께 부근에서 최대 자기저항비 값을 얻을 수 있었으며, 이는 터널배리어층 부근의 계면영역이 터널링 스핀분극에 주요한 역할을 하기 때문으로 보인다. 다층막내의 Co층의 두께가 증가함에 따라 자기저항비는 다소 복잡한 거동을 나타내었으며, 이는 Co층의 두께 증가에 따른 수직자기이방성의 변화와 계면거칠기 감소에 따른 접합저항의 감소가 복합적으로 작용하기 때문이다. Pd층의 경우 Co층과는 달리 자기저항변화(${\Delta}R$)감소가 자기저항비의 거동에 영향을 주었으며, 이는 비자성층인 Pd층의 증가에 따라 스핀산란이 증가하기 때문이다.