巨磁阻模型中热产生分布的理论研究.pdfVIP

Modern Physics 现代物理, 2017, 7(2), 25-31 Published Online March 2017 in Hans. /journal/mp /10.12677/mp.2017.72004 Theory of the Heat Generation in Giant Magnetoresistance Model Xiaoxue Zhang Beijing Technology and Business University, Beijing th th th Received: Feb. 24 , 2017; accepted: Mar. 12 , 2017; published: Mar. 15 , 2017 Abstract Spin caloritronics is a newly-explored research field concerning mainly the interaction of spin and heat, and has attracted extensive research interests recently. Heat generation in magnetic multilayers is a serious problem, because it has significant effects on the electric, thermal, and magnetic properties of nanoscale electronic devices. Here we study theoretically the heat gen- eration due to spin transport in magnetic multilayers by using a macroscopic approach based on the Boltzmann equation. There exists extra heat generation due to spin accumulation besides the nominal Joule heat, when a current flows through the magnetic multilayers. On the basis of the giant magnetoresistance (GMR) model, we derived the expressions for the distribution of heat generation. We also compared the distribution and magnitude of the heat generation in an- tiparallel (AP) and parallel (P) alignments. Our analysis shows that the AP alignment leads to larger heat generation than the P alignment. Therefore, the heat generation in the structure changes dramatically with the relative alignment of the two ferromagnetic layers, which is simi- lar to the GMR effect. Keywords Giant Magnetoresistance Model, Spin-Dependent Heat Generation, Antiparallel Configuration, Parallel Configuration