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Open AccessArticle

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
Materials 2015, 8(7), 3854-3863; https://doi.org/10.3390/ma8073854
Received: 17 April 2015 / Revised: 25 May 2015 / Accepted: 15 June 2015 / Published: 25 June 2015
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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MDPI and ACS Style

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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