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Dive into the research topics where Sang Soo Yu is active.

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Featured researches published by Sang Soo Yu.


Journal of The Korean Magnetics Society | 2009

Formation of Ferromagnetic Ge₃Mn₅ Phase in MBE-grown Polycrystalline Ge 1 − x Mn x Thin Films

Hyeong Kyu Lim; Tran Thi Lan Anh; Sang Soo Yu; Kui-Jong Baek; Young Eon Ihm; Dojin Kim; Hyojin Kim; Changsoo Kim

다결정 Ge 1 ? x Mn x 박막의 자기적 상들에 관한 연구가 이루어졌다. Molecular beam epitaxy(MBE) 장비를 이용해 400 ℃에서 Ge 1 ? x Mn x 박막을 성장시켰다. Ge 1 ? x Mn x 박막의 캐리어 유형은 P타입 이였고, 전기 비저항 값은 4.0 × 10 ?2 ~1.5 × 10 ?4 ohm-㎝이었다. 자기적인 특성과 미세구조의 분석에 기초하여 Ge 1 ? x Mn x /SiO₂/Si(100) 박막에 310 K 이내의 큐리에온도를 지닌 강자성의 Ge₃Mn? 상이 형성되었음을 알 수 있었다. 게다가, Ge₃Mn? 상이 형성된 Ge 1 ? x Mn x 박막은 20 K, 9 T의 자기장에서 약 9 %의 음의 자기저항을 보였다.


nano/micro engineered and molecular systems | 2007

Magnetic and Magnetotransport Properties of Annealed Amorphous Ge 1-x Mn x Semiconductor Thin Films

Sang Soo Yu; Tran Thi Lan Anh; Young Eon Ihm; Dojin Kim; Hyojin Kim; Soon Ku Hong; Chang-Soo Kim; Hyun Ryu

Amorphous Ge<sub>1-x </sub>Mn<sub>x</sub> thin films grown by low temperature vapor deposition were annealed and their electrical and magnetic properties have been studied. Amorphous Ge<sub>1-x</sub>Mn<sub>x</sub> thin films were annealed at 300°C, 400°C, 500°C, 600°C and 700°C for 3 minutes in high vacuum chamber. X-ray diffraction and TEM analyses reveal that as-grown Ge<sub>1-x</sub>Mn<sub>x</sub> thin films are amorphous, and fine crystalline phases are precipitated when annealed. The fine crystalline precipitates appear at the lower temperature as the Mn concentration of amorphous Ge<sub>1-x </sub>Mn<sub>x</sub> thin films increases. As-grown amorphous Ge<sub>1-x </sub>Mn<sub>x</sub> thin films have p-type majority carriers and the type of majority carriers is not changed after annealing, but the electrical resistivity increases with annealing temperature. Magnetization characteristics show that the as-grown amorphous Ge<sub>1-x </sub>Mn<sub>x</sub> thin films are ferromagnetic and the Curie temperatures are around 130K. Curie temperature and saturation magnetization of annealed Ge<sub>1-x </sub>Mn<sub>x</sub> thin films increase with annealing temperature. There are different mechanisms to understand increasing of Curie temperature that is related with annealing temperature. Firstly, interaction between Mn spins might be changed by annealing effect. Secondly, magnetization behavior and X-ray analysis imply that the formation of ferromagnetic Ge<sub>3</sub>Mn<sub>5</sub> phase causes the change of magnetic and electrical properties of annealed Ge<sub>1-x </sub>Mn<sub>x</sub> thin films.


Journal of Magnetism and Magnetic Materials | 2004

Annealing effect on magnetic and electronic properties of polycrystalline Ge1-xMnx semiconductors grown by MBE

Young Mi Cho; Sang Soo Yu; Young Eon Ihm; Dojin Kim; Hyojin Kim; Jong Sung Baek; Chang-Soo Kim; Byoung Taek Lee


Current Applied Physics | 2006

Magneto-transport properties of amorphous Ge1−xMnx thin films

Sang Soo Yu; Tran Thi Lan Anh; Young Eon Ihm; Dojin Kim; Hyojin Kim; Soon Ku Hong; Sangjun Oh; Chang-Soo Kim; Hwack Joo Lee; Byung Chill Woo


Current Applied Physics | 2006

Magnetic and electrical properties of MBE-grown (Ge1−xSix)1−yMny thin films

Sang Soo Yu; Young Mi Cho; Young Eon Ihm; Dojin Kim; Hyojin Kim; Soon Ku Hong; Sangjun Oh; Byung Chill Woo; Chang-Soo Kim


Solid State Communications | 2005

Ferromagnetism in amorphous Ge1−xMnx grown by low temperature vapor deposition

Sang Soo Yu; Tran Thi Lan Anh; Young Eon Ihm; Dojin Kim; Hyojin Kim; Sangjun Oh; Chang-Soo Kim; Hyun Ryu


Journal of Magnetism and Magnetic Materials | 2006

Growth and magnetism in amorphous Si1−xMnx thin films grown by thermal deposition

Sang Soo Yu; Ki Hak Kim; Young Eon Ihm; Dojin Kim; Hyojin Kim; Soon Ku Hong; Changsoo Kim; Hyun Ryu; Sangjun Oh


Journal of Magnetism and Magnetic Materials | 2004

Magneto-electronic properties of Ge1−xMnx thin films grown by MBE

Young Eon Ihm; Sang Soo Yu; Dojin Kim; Hyojin Kim; Kap Ho Lee; Chang-Soo Kim; Byong-Taek Lee


Journal of Magnetism and Magnetic Materials | 2006

Magnetic and electrical properties of amorphous Ge1−xCrx thin films grown by low temperature vapor deposition

Sang Soo Yu; Kyung Hee Han; Young Eon Ihm; Dojin Kim; Hyojin Kim; Chang-Soo Kim; Hyun Ryu; Sangjun Oh


Current Applied Physics | 2006

Neutron irradiation effects on polycrystalline Ge1−xMnx thin films grown by MBE

Young Mi Cho; Sang Soo Yu; Young Eon Ihm; Seoung Won Lee; Dojin Kim; Hyojin Kim; Jae Min Sohn; Bong Goo Kim; Young Hwan Kang; Sangjun Oh; Chang-Soo Kim; Hwack Joo Lee

Collaboration


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Dojin Kim

Chungnam National University

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Hyojin Kim

Seoul National University

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Young Eon Ihm

Chungnam National University

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Chang-Soo Kim

Korea Research Institute of Standards and Science

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Soon Ku Hong

Chungnam National University

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Tran Thi Lan Anh

Chungnam National University

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Young Mi Cho

Chungnam National University

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Hyun Ryu

Korea Research Institute of Standards and Science

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Byung Chill Woo

Korea Research Institute of Standards and Science

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Ki Hak Kim

Chungnam National University

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