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Materials 2015, 8(7), 3854-3863; doi:10.3390/ma8073854

Current Induced Heat Generation in Ferromagnet-Quantum Dot-Ferromagnet System

1
Department of Fundamental Courses, Academy of Armored Force Engineering, Beijing 100072, China
2
Department of Maths and Physics, Hunan Institute of Engineering, Xiangtan 411104, Hunan, China
3
Mechanical and electrical engineering college, Yanching Institute of Technology, Langfang 065201, Hebei, China
4
Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
*
Author to whom correspondence should be addressed.
Academic Editor: Maryam Tabrizian
Received: 17 April 2015 / Revised: 25 May 2015 / Accepted: 15 June 2015 / Published: 25 June 2015
View Full-Text   |   Download PDF [342 KB, uploaded 25 June 2015]   |  

Abstract

We study the heat generation in ferromagnet-quantum dot-ferromagnet system by the non-equilibrium Green’s functions method. Heat generation under the influence of ferromagnet leads is very different compared with a system with normal metal leads. The significant effects in heat generation are caused by the polarization angle θ associated with the orientation of polarized magnetic moment of electron in the ferromagnetic terminals. From the study of heat generation versus source drain bias (Q-eV) curves, we find that the heat generation decreases as θ increases from 0 to 0.7π. The heat generation versus gate voltage (Q-eVg) curves also display interesting behavior with increasing polarization angle θ. Meanwhile, heat generation is influenced by the relative angle θ of magnetic moment in the ferromagnetic leads. These results will provide theories to this quantum dot system as a new material of spintronics. View Full-Text
Keywords: heat generation; ferromagnet terminals; non-equilibrium Green’s functions; metamaterials heat generation; ferromagnet terminals; non-equilibrium Green’s functions; metamaterials
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zhao, L.; Chen, Q.; Zhang, Y.; Zhao, L. Current Induced Heat Generation in Ferromagnet-Quantum Dot-Ferromagnet System. Materials 2015, 8, 3854-3863.

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