Influence of Phase-Change Materials and Additional Layer on Performance of Lateral Phase-Change Memories

2011 ◽  
Vol 497 ◽  
pp. 106-110
Author(s):  
You Yin ◽  
Sumio Hosaka
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Phase Change ◽  
Phase Change Materials ◽  
Electrical Characterization ◽  
Element Analysis ◽  
Additional Layer ◽  
Thermal Confinement ◽  
High Power Consumption ◽  
High Level

Performance of lateral phase change memories (LPCMs) is investigated by both electrical characterization and finite element analysis. Ge2Sb2Te5 lateral PCMs (GST-LPCMs) exhibit a low reset current but a bad endurance. By replacing GST with Sb2Te3 (ST) and adding a TiN layer between ST and electrodes, the ST-TiN-LPCMs are demonstrated to have a much improved endurance. Finite element analysis of the LPCMs with electric-thermal structural interaction shows that thermal confinement makes GST-LPCMs low-power consumptive but that high level stress makes them readily broken. In contrast, ST-TiN-LPCMs experience low level stress during operation but high power consumption is required.

Phase Change Materials Applied in Thermal Design

2013 ◽  
Vol 750-752 ◽  
pp. 1211-1214
Author(s):  
Shu Yang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Solar Energy ◽  
Phase Change ◽  
Phase Change Material ◽  
Phase Change Materials ◽  
Thermal Design ◽  
Electronic Equipment ◽  
Element Analysis ◽  
Change Material

Phase change material has been widely used in the fields of solar energy, aerospace, aviation, and buildings. In this paper, paraffin is applied in the thermal design of electronic equipment, in order to maintain a constant working circumstance. Finite-element analysis is implemented to analyze the feasibility of this thermal design.

Development of plug-ins to predict effective thermal conductivity of woven and microencapsulated phase change composite

2016 ◽  
Vol 51 (6) ◽  
pp. 733-743
Author(s):  
Muhammad Owais Raza Siddiqui ◽  
Danmei Sun
Keyword(s):  
Thermal Conductivity ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Phase Change ◽  
Effective Thermal Conductivity ◽  
Phase Change Materials ◽  
Research Work ◽  
Element Analysis ◽  
Microencapsulated Phase Change Materials ◽  
Automatic Model Generation

The thermal property of textile structures plays an important role in the understanding of thermal behaviour of the clothing. In this work, user-friendly GUI plug-ins have been developed to generate both microscopic and mesoscopic scale models for finite element analysis. The plug-ins were developed by using Abaqus/CAE as a platform. The GUI Plug-ins enable automatic model generation and prediction of the effective thermal conductivity of woven composite and microencapsulated Phase Change Materials composites via finite element analysis by applying boundary conditions. The predicted effective thermal conductivities from plug-ins have been compared with the results obtained from published experimental research work based on an established mathematical model. They are correlated well. Moreover, the influence of phase change materials on heat transfer behaviour of microencapsulated Phase Change Materials composites was further analysed.

A Novel Phase Change Memory with a Separate Heater Characterized by Constant Resistance for Multilevel Storage

2013 ◽  
Vol 534 ◽  
pp. 136-140
Author(s):  
Rosalena Irma Alip ◽  
Ryota Kobayashi ◽  
Yu Long Zhang ◽  
Zulfakri bin Mohamad ◽  
You Yin ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Phase Change ◽  
Gradual Increase ◽  
Phase Change Memory ◽  
Memory Device ◽  
Element Analysis ◽  
Multilevel Storage ◽  
Constant Resistance ◽  
Change Memory

A novel phase change memory structure with a separate heater was proposed for a multilevel storage. Finite element analysis was conducted to investigate the possibility of multilevel storage. 100 ns SET pulses, with an increasing amplitude from 0.5 V to 3 V, were applied for heating the phase change layer, Ge2Se2T5 (GST). From the simulation result, it was exhibited that the temperature in the GST layer increased gradually when an increasing pulse is applied to the separate heater layer (N-TiSi3). This implies that crystallization is well controlled by changing the amplitude of the applied SET pulse. The gradual increase in the temperature leads to gradual resistance drop, depending strongly on the capping material. The gradual resistance drop will allow multilevel storage for the memory device.

Stability of mirror chambers and mechanics: an example of the improvement of vibrational behaviour

2010 ◽  
Vol 1 (MEDSI-6) ◽  
Author(s):  
C. Ruget ◽  
L. Nikitina ◽  
J. Nicolas ◽  
J.C. Martinez ◽  
J. Juanhuix
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Degrees Of Freedom ◽  
High Stability ◽  
Element Analysis ◽  
Detailed Design ◽  
The Finite Element Analysis ◽  
Synchrotron Light ◽  
High Level ◽  
Low Emittance

ALBA synchrotron light facility includes a 3 GeV low-emittance storage ring capable of running in the top-up mode which will feed a number of beamlines. Xaloc and CIRCE are among these beamlines. These beamlines are equipped with mirrors which need high stability. There are a lot of mirror chambers in the market and we decided to improve one of them rather than developing a new one. For this purpose, the ALBA team organized a collaboration with a supplier of beamline components. ALBA did the conceptual design of the improvements, the Finite Element Analysis (FEA) optimization and the metrology tests. The supplier provided a detailed design and the production. The improvement was implemented on several mirror chambers including actuators from two to five degrees of freedom. At the beginning of the project, the hypothesis was an excitation coming from the ground lower than 1 µm for frequencies below 45 Hz and negligible above it. The strategy[0] in terms of dynamical stability was not to amplify the ground excitation below 45 Hz or around 50 Hz. That is, to increase the frequency of the system resonances above 45 Hz (excluding the range of about 50 Hz). As a result, we obtained a high level of stability for such mirror systems and we almost met the target value for the first mode of vibration.

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