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.
Highlights
With the development of industry and information technology, various nano-devices have been designed and fabricated in laboratories, such as the electromagnetic quantum dot (QD) constructed single electron diodes and transistors [1,2,3,4]
The current and the heat generation in FM-QD-FM system are deeply suppressed compared with the metal-QD-metal system
Heat generation increases with increasing magnitudes of temperature
Summary
With the development of industry and information technology, various nano-devices have been designed and fabricated in laboratories, such as the electromagnetic quantum dot (QD) constructed single electron diodes and transistors [1,2,3,4]. Sun and Xie proposed a general formula for heat generation in lead-QD-lead system by non-equilibrium Green’s functions (NEGF) method. The heat generation problem is proposed in the spintronic nano-device with tunneling electrodes (at least one ferromagnetic lead) at different temperatures [24]. This is far from clear for the heat generation characteristics of spintronic lead coupling devices. These effects could cause the novel behaviors of heat generation which are important in controlling the heat generation performance of spintronic nano-devices.
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