Response of colloidal liquids containing magnetic holes of different volume densities to magnetic field characterized by transmission measurement

doi:10.1088/1674-1056/19/10/107503

中国物理B ›› 2010, Vol. 19 ›› Issue (10): 107503-107503.doi: 10.1088/1674-1056/19/10/107503

Response of colloidal liquids containing magnetic holes of different volume densities to magnetic field characterized by transmission measurement

Achanta Venu Gopal¹, 孙婷², 符志成², 戴峭峰², 吴立军², 兰胜², 邓海东³, 赵韦人⁴

(1)Department of Condensed Matter Physics and Material Science, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400005, India; (2)Laboratory of Photonic Information Technology, School for Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China; (3)Laboratory of Photonic Information Technology, School for Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China; College of Science, South China Agricultural University, Guangzhou 510642, China; (4)School of Physics and Optoelectronics, Guangdong University of Technology, Guangzhou 510006, China

收稿日期:2010-02-02 修回日期:2010-04-20 出版日期:2010-10-15 发布日期:2010-10-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 10974060 and 10774050), the Program for Innovative Research Team of the Higher Education of Guangdong Province of China (Grant No. 06CXTD005) and President Foundation of South China Agricultural University (Grant No. 2009K018).

Response of colloidal liquids containing magnetic holes of different volume densities to magnetic field characterized by transmission measurement

Deng Hai-Dong(邓海东)^a)b), Sun Ting(孙婷)^a), Zhao Wei-Ren(赵韦人)^c), Fu Zhi-Cheng(符志成)^a), Dai Qiao-Feng(戴峭峰)^a), Wu Li-Jun(吴立军)^a), Lan Sheng(兰胜)^a)†, and Achanta Venu Gopal^d)

^a Laboratory of Photonic Information Technology, School for Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China; ^b College of Science, South China Agricultural University, Guangzhou 510642, China; ^c School of Physics and Optoelectronics, Guangdong University of Technology, Guangzhou 510006, China; ^d Department of Condensed Matter Physics and Material Science, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400005, India

Received:2010-02-02 Revised:2010-04-20 Online:2010-10-15 Published:2010-10-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 10974060 and 10774050), the Program for Innovative Research Team of the Higher Education of Guangdong Province of China (Grant No. 06CXTD005) and President Foundation of South China Agricultural University (Grant No. 2009K018).

摘要/Abstract

摘要： This paper systematically investigates the response of colloidal liquids containing magnetic holes of different volume densities to magnetic field by conventional transmission measurements. It finds that the enhancement in the transmission of such a colloidal liquid under a magnetic field exhibits a strong dependence on the volume density of magnetic holes. A linear increase in the maximum enhancement factor is observed when the volume density of magnetic holes is below a critical level at which a maximum enhancement factor of ～150 is achieved in the near infrared region. Once the volume density of magnetic holes exceeds the critical level, a sharp drop of the maximum enhancement factor to ～2 is observed. After that, the maximum enhancement factor increases gradually till a large volume density of ～9%. By monitoring the arrangement of magnetic holes under a magnetic field, it reveals that the colloidal liquids can be classified into three different phases, i.e., the gas-like, liquid-like and solid-like phases, depending on the volume density of magnetic holes. The response behaviour of colloidal liquids to magnetic field is determined by the interaction between magnetic holes which is governed mainly by their volume density. A phase transition, which is manifested in the dramatic reduction in the maximum enhancement factor, is clearly observed between the liquid-like and solid-like phases. The optical switching operations for colloidal liquids in different phases are compared and the underlying physical mechanisms are discussed.

Abstract: This paper systematically investigates the response of colloidal liquids containing magnetic holes of different volume densities to magnetic field by conventional transmission measurements. It finds that the enhancement in the transmission of such a colloidal liquid under a magnetic field exhibits a strong dependence on the volume density of magnetic holes. A linear increase in the maximum enhancement factor is observed when the volume density of magnetic holes is below a critical level at which a maximum enhancement factor of ～150 is achieved in the near infrared region. Once the volume density of magnetic holes exceeds the critical level, a sharp drop of the maximum enhancement factor to ～2 is observed. After that, the maximum enhancement factor increases gradually till a large volume density of ～9%. By monitoring the arrangement of magnetic holes under a magnetic field, it reveals that the colloidal liquids can be classified into three different phases, i.e., the gas-like, liquid-like and solid-like phases, depending on the volume density of magnetic holes. The response behaviour of colloidal liquids to magnetic field is determined by the interaction between magnetic holes which is governed mainly by their volume density. A phase transition, which is manifested in the dramatic reduction in the maximum enhancement factor, is clearly observed between the liquid-like and solid-like phases. The optical switching operations for colloidal liquids in different phases are compared and the underlying physical mechanisms are discussed.

Key words: magnetic holes, phases change, optical switching operations

中图分类号: (Magnetic liquids)

75.50.Mm

75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects) 82.70.Dd (Colloids)

邓海东, 孙婷, 赵韦人, 符志成, 戴峭峰, 吴立军, 兰胜, Achanta Venu Gopal. Response of colloidal liquids containing magnetic holes of different volume densities to magnetic field characterized by transmission measurement[J]. 中国物理B, 2010, 19(10): 107503-107503.

Deng Hai-Dong(邓海东), Sun Ting(孙婷), Zhao Wei-Ren(赵韦人), Fu Zhi-Cheng(符志成), Dai Qiao-Feng(戴峭峰), Wu Li-Jun(吴立军), Lan Sheng(兰胜), and Achanta Venu Gopal. Response of colloidal liquids containing magnetic holes of different volume densities to magnetic field characterized by transmission measurement[J]. Chin. Phys. B, 2010, 19(10): 107503-107503.

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Response of colloidal liquids containing magnetic holes of different volume densities to magnetic field characterized by transmission measurement

Response of colloidal liquids containing magnetic holes of different volume densities to magnetic field characterized by transmission measurement

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