Exchange bias in graphitic C/Co composites

Тип публикации: статья из журнала

Год издания: 2017

Идентификатор DOI: 10.1016/j.carbon.2016.12.060

Ключевые слова: Carbides, Carbon, Dichroism, High resolution transmission electron microscopy, Magnetoelectronics, Transmission electron microscopy, X ray absorption, Electronics production, Exchange bias effects, Experimental evidence, Magnetic interactions, Potential materials, Spintronics application, Theoretical modeling, X-ray magnetic circular dichroism, Magnetic materials

Аннотация: The exchange bias (EB) effect, which is the shift of the hysteresis loop of a ferromagnet in direct contact with an antiferromagnet, is highly advantageous for the development of spintronics applications. Carbon (C) has been considered as a potential material in next generation electronics production as well as spintronics devices beyond silicon. Here we show experimental evidence for an EB in C/Co composites. The significant EB needs thermal annealing to occur. X-ray absorption spectra and transmission electron microscopy data of these samples reveal that Co carbides in as grown samples decompose and form graphitic C/Co interfaces after annealing. Using x-ray magnetic circular dichroism we have detected the C spins that are responsible for the EB. These results inspire a theoretical model to investigate the magnetic interactions in graphitic C/Co interfaces and interpret the observed results. (C) 2016 Elsevier Ltd. All rights reserved.

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Издание

Журнал: CARBON

Выпуск журнала: Vol. 114

Номера страниц: 642-648

ISSN журнала: 00086223

Место издания: OXFORD

Издатель: PERGAMON-ELSEVIER SCIENCE LTD

Авторы

  • Hsu Hua-Shu (Natl Pingtung Univ, Dept Appl Phys, 4-18 Minsheng Rd, Pingtung 90044, Taiwan)
  • Chang Yu-Ying (Natl Pingtung Univ, Dept Appl Phys, 4-18 Minsheng Rd, Pingtung 90044, Taiwan)
  • Chin Yi-Ying (Natl Synchrotron Radiat Res Ctr, 101 Hsin Ann Rd, Hsinchu 30013, Taiwan)
  • Lin Hong-Ji (Natl Synchrotron Radiat Res Ctr, 101 Hsin Ann Rd, Hsinchu 30013, Taiwan)
  • Chen Chien-Te (Natl Synchrotron Radiat Res Ctr, 101 Hsin Ann Rd, Hsinchu 30013, Taiwan)
  • Sun Shih-Jye (Natl Univ Kaohsiung, Dept Appl Phys, 700 Kaohsiung Univ Rd, Kaohsiung 81148, Taiwan)
  • Zharkov Sergey M. (SB RAS, Kirensky Inst Phys, Akademgorodok 50,Bld 38, Krasnoyarsk 660036, Russia; Siberian Fed Univ, 79 Svobodny Pr, Krasnoyarsk 660041, Russia)
  • Lin Chun-Rong (Natl Pingtung Univ, Dept Appl Phys, 4-18 Minsheng Rd, Pingtung 90044, Taiwan)
  • Ovchinnikov Sergey G. (SB RAS, Kirensky Inst Phys, Akademgorodok 50,Bld 38, Krasnoyarsk 660036, Russia; Siberian Fed Univ, 79 Svobodny Pr, Krasnoyarsk 660041, Russia)

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