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Lattice dynamics of FeMnP_(0.5)Si_(0.5) compound from first principles calculation 被引量:3
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作者 B.Wurentuya Shuang Ma +2 位作者 b.narsu O.Tegus Zhidong Zhang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2019年第1期127-133,共7页
Understanding the role of lattice vibrations on first-order magnetic transitions is essential for their fundamental description, as well as for the optimization of the related functional properties. Here, we present a... Understanding the role of lattice vibrations on first-order magnetic transitions is essential for their fundamental description, as well as for the optimization of the related functional properties. Here, we present a first principles study on the lattice dynamics of the MnFeP_(0.5)Si_(0.5) compound. The phonon spectra are obtained by Density Functional Theory(DFT) calculations in combination with frozen phonon method.DFT calculations reproduce most of the features observed in experiments including the lattice softening across the magnetic phase transition and the pronounced shift of phonon peak. The site projected phonon density of states(pDOS) shows that the local vibrations of Mn atoms have an essential contribution to the overall lattice softening. Moreover, the local lattice vibrations of Mn atoms are rather featureless in the paramagnetic state(PM) and thus the total pDOS evolution across the transition appears to be dominated by Fe. The lattice vibrations of both Fe and Mn in the PM state are very sensitive to the local environment,which shows that the magnetic order and the local chemical environment are strongly coupled in this compound. 展开更多
关键词 LATTICE dynamics Magnetic phase TRANSITION PHONON SOFTENING First PRINCIPLES calculation
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Design and optimization of cantilevered magnetostrictive film-substrate microactuator 被引量:1
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作者 b.narsu 《Science China(Technological Sciences)》 SCIE EI CAS 2007年第5期683-693,共11页
The exact solution for the bending problem of a free-end point loaded film- substrate cantilever with arbitrary film-to-substrate thickness ratio is obtained by using the basic mechanical equilibrium equation. And the... The exact solution for the bending problem of a free-end point loaded film- substrate cantilever with arbitrary film-to-substrate thickness ratio is obtained by using the basic mechanical equilibrium equation. And then the problem of design and optimization for microactuator buildup of film-substrate cantilever is discussed by taking into account the effect of geometrical and physical parameters of the cantilever components. Furthermore, the optimal condition for actuator application is presented and some theoretical problems are clarified. The results show that, in general, the greater the film-to-substrate thickness ratio, the higher the ability of taking load, namely the larger the exerted force of the cantilever when the thickness of substrate is kept constant. When the total thickness of the cantilever is kept constant, however, the free-end exerted force will experience a maximum and this maximum value of the exerted force will decrease with the increasing film-to-sub- strate stiffness ratio. Meanwhile, the optimal thickness ratio corresponding to this maximum exerted force also decreases with the increasing stiffness ratio. Whether for the cases of fixed substrate or fixed total thickness, the influence of Poisson’s ratio of two cantilever components on the exerted force is remarkable, and should not be neglected. 展开更多
关键词 magnetic film-substrate system cantilever deflection actuator exerted FORCE
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