Effects of ultra-high vacuum on crystallographic, recording and magnetic properties of thin film media

1998 ◽  
Vol 34 (4) ◽  
pp. 1576-1578 ◽  
Author(s):  
C. Gao ◽  
S. Wu ◽  
J.-P. Chen ◽  
R. Malmhall ◽  
C. Habermeier ◽  
...  
2019 ◽  
Vol 75 (5) ◽  
pp. 373-379
Author(s):  
Muhammad Khalid Alamgir ◽  
M. Ikram ◽  
Ghalib Hussain Mughal ◽  
Ghulam Asghar ◽  
Shafiq ur Rehman ◽  
...  

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Qilong Cheng ◽  
Sukumar Rajauria ◽  
Erhard Schreck ◽  
Robert Smith ◽  
Na Wang ◽  
...  

AbstractThe microelectronics industry is pushing the fundamental limit on the physical size of individual elements to produce faster and more powerful integrated chips. These chips have nanoscale features that dissipate power resulting in nanoscale hotspots leading to device failures. To understand the reliability impact of the hotspots, the device needs to be tested under the actual operating conditions. Therefore, the development of high-resolution thermometry techniques is required to understand the heat dissipation processes during the device operation. Recently, several thermometry techniques have been proposed, such as radiation thermometry, thermocouple based contact thermometry, scanning thermal microscopy, scanning transmission electron microscopy and transition based threshold thermometers. However, most of these techniques have limitations including the need for extensive calibration, perturbation of the actual device temperature, low throughput, and the use of ultra-high vacuum. Here, we present a facile technique, which uses a thin film contact thermometer based on the phase change material $$Ge_2 Sb_2 Te_5$$ G e 2 S b 2 T e 5 , to precisely map thermal contours from the nanoscale to the microscale. $$Ge_2 Sb_2 Te_5$$ G e 2 S b 2 T e 5 undergoes a crystalline transition at $$\hbox {T}_{{g}}$$ T g with large changes in its electric conductivity, optical reflectivity and density. Using this approach, we map the surface temperature of a nanowire and an embedded micro-heater on the same chip where the scales of the temperature contours differ by three orders of magnitude. The spatial resolution can be as high as 20 nanometers thanks to the continuous nature of the thin film.


2008 ◽  
Vol 66 (2) ◽  
pp. 171-174 ◽  
Author(s):  
C. Ko ◽  
Y. M. Lee ◽  
H. J. Shin ◽  
M.-C. Jung ◽  
M. Han ◽  
...  

2014 ◽  
Vol 118 (36) ◽  
pp. 20927-20939 ◽  
Author(s):  
Zheng Zhang ◽  
Hongmei Jin ◽  
Jianwei Chai ◽  
Lu Shen ◽  
Hwee Leng Seng ◽  
...  

2019 ◽  
Author(s):  
Marko Melander ◽  
Hannes Jonsson

<p>Low-dimensional materials, such as ultrathin films, nanoislands and wires, are actively being researched due to their interesting magnetic properties and possible technological applications for example in high density data storage. Results of calculations of an Fe nanoisland on a W(110) support are presented here with particular focus on the effect of hydrogen adsorption on its magnetic properties. This is an important consideration since hydrogen is present even under ultra-high vacuum conditions. The calculations are based on density functional theory within the generalized gradient approximation. The adsorption of H atoms is found to strongly decrease the magnetic moment of the Fe atoms they are bound to, down to less than a half in some cases as compared with the clean Fe island. The results show that it may be important to take the presence of hydrogen into account in measurements of magnetic properties of nanoislands.</p>


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