Effects of initial layer surface roughness on GMR performance of Si/Cu/NiFe/Cu/Co/Cu/NiFe dual spin-valves for MRAM

2000 ◽  
Vol 36 (5) ◽  
pp. 2850-2852 ◽  
Author(s):  
Seongtae Bea ◽  
N. Matsushita ◽  
S. Zurn ◽  
L. Sheppard ◽  
E.J. Torok ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Spin Valves ◽  
Layer Surface ◽  
Initial Layer

scholarly journals Rated definition of degree of cutter coating influence upon parameters of surface layer quality of parts worked

2017 ◽  
Vol 2 (7) ◽  
pp. 20-24
Author(s):  
Вячеслав Безъязычный ◽  
Vyacheslav Bezyazychnyy ◽  
Максим Басков ◽  
Maksim Baskov
Keyword(s):  
Surface Roughness ◽  
Surface Layer ◽  
Residual Stresses ◽  
Layer Surface ◽  
Wear Resistant Coatings ◽  
Cutter Wear ◽  
Definition Of ◽  
Surface Layer Quality ◽  
The Impact

The impact of cutter wear-resistant coatings upon cutting process parameters and characteristics of surface layer quality in the parts worked: residual stresses, a degree and a depth of work hardening of a surface layer, surface roughness is investigated.

Large Magnetoresistance Variation of Pseudo Spin Valves with Different Nano Oxide Layer Position

2007 ◽  
Vol 1032 ◽  
Author(s):  
Jeong Dae Suh ◽  
C.A. Ross
Keyword(s):  
Surface Roughness ◽  
Oxide Layer ◽  
Multilayer Structure ◽  
Giant Magnetoresistance ◽  
Spin Valves ◽  
Resistance Change ◽  
Nano Oxide ◽  
Shunting Effect ◽  
Spin Dependent Scattering ◽  
Layer Position

AbstractWe have investigated the influence of the nano-oxide layer positions on giant magnetoresistance(GMR) of the NiFe(9nm)/Cu(4nm)/Co(5nm) pseudo spin valves. Nano-oxide layer positions had a several effects on the multilayer structure that changes its magnetotransport behavior. GMR ratio varied between 2.8% and 0.15% depending on the nano-oxide layer positions within the stack. The increase of the GMR ratio was accompanied by increase in resistance change, decrease in sheet resistance, and decrease in surface roughness. These significant variations of GMR ratio was explained by the changes on the spin dependent scattering or current shunting effect. Our results showed that appropriate placement of a nano-oxide layer was essential fo optimize magnetoresistance and properties of spin valves.

Double Layer Processes of LBMO/YBCO and Crystalline Degradations

2005 ◽  
Vol 887 ◽  
Author(s):  
Hong Zhu ◽  
Masanori Okada ◽  
Hidetaka Nakashima ◽  
Ajay K. Sarkar ◽  
Hirofumi Yamasaki ◽  
...  
Keyword(s):  
Thin Films ◽  
Surface Roughness ◽  
Double Layer ◽  
Ion Beam ◽  
Double Layers ◽  
Layer Surface ◽  
Ion Beam Sputtering ◽  
Minimum Surface ◽  
Layer Deposition ◽  
Beam Sputtering

ABSTRACTDouble Layer Processes of LBMO/YBCO and Crystalline Degradations Oxide microwave devices will be widely expected in mobile communication system in the near future in the world. Superconducting YBa2Cu3Ox (YBCO) thin films are most advisable for microwave filter devices due to their very low surface resistance. Next generation devices are tunable microwave filters formed by double layers consisting of YBCO and ferromagnetic manganites such as La(Ba)MnO3 (LBMO).In order to complete excellent double layers, we must first obtain proper techniques to fabricate perfect a/c-phases of YBCO and excellent crystalline LBMO single layers on substrate at low substrate temperatures (Ts), and then fabricate their double layers. We have tried an ion beam sputtering (IBS), then now we can control the perfect a-c orientation growths of YBCO. The minimum surface roughness is 1 nm for the c-phase and 0.3 nm for the a-phase.Excellent crystalline thin films of LBMO can be grown by IBS with controlling Ts, oxygen pressure (Po) and oxygen molecular or plasma supply on MgO and LAO substrates. It can be grown down to 480 deg C. The minimum rocking half-width is 0.01 deg, and the minimum surface roughness is 0.8 nm. As-grown LBMO film shows different metal-insulator transition and Curier temperatures. The results are interpreted by a phase separation and magnetostriction.The double layers of YBCO on LBMO and LBMO on YBCO were fabricated by IBS. In YBCO/LBMO, the excellent a/c-YBCO can be grown on the underlying LBMO at 600-650 °C. The crystallinity of overlying YBCO is nearly the same with that of the single layers on MgO and LAO. The mosaicity of YBCO is much better than that of the single layers on MgO and LAO. It is noticed that the underlying LBMO crystallinity can be improved, and the mosaicity is not degraded after the double layer deposition. A n inferiority is that the double layer surface is much degraded. Then we should fabricate the smooth underlying LBMO. In LBMO/YBCO, the excellent crystalline LBMO can be grown on the underlying a/c-YBCO at 650-700 deg C. The better crystalline LBMO grows on the better crystalline YBCO. The LBMO/a-YBCO clearly shows XRD peak separations while the LBMO/c-YBCO shows peak overlappings. The crystallinity of overlying LBMO is slightly poorer that that of the single layers on LAO. The mosaicity of LBMO is much poorer than that of the single layers of LBMO on LAO, but is almost the same with that of the underlying YBCO. It should be noticed that the crystallinity of underlying YBCO is degraded considerably after the double layer deposition. Then we should deposite the overlying LBMO at low temperatures. However a superiority is that the double layer surface is not degraded or rather improved. Now we are estimating time-dependence of the crystalline degradations on the single and double layers. YBCO crystallinity is easily degraded with time but LBMO is very stable. Then LBMO/YBCO is advisable in terms of a long term degradation.

Interlayer coupling and surface roughness in GMR spin valves

1996 ◽  
Vol 32 (5) ◽  
pp. 3434-3436 ◽  
Author(s):  
D. Wei ◽  
H.N. Bertram
Keyword(s):  
Surface Roughness ◽  
Interlayer Coupling ◽  
Spin Valves

scholarly journals Changes in Surface Roughness Caused by Electrical Discharge Coating

2019 ◽  
Vol 13 (5) ◽  
pp. 665-670 ◽  
Author(s):  
Hideki Takezawa ◽  
Naotake Mohri ◽  
Toshiya Kusama ◽  
◽  
Keyword(s):  
Surface Roughness ◽  
Electrical Discharge ◽  
Temporal Change ◽  
Peak Height ◽  
Machining Process ◽  
Layer Surface ◽  
Sintered Compact ◽  
Surface Level ◽  
The Core ◽  
Original Surface

The effects of surface modification using an electrical discharge coating are investigated. The electrode used for the machining process is a Ti-type semi-sintered compact electrode. A thin and hard layer is formed on the machining surface. In this paper, the change in surface roughness during electrical discharge coating is described. The accretion layer surface became coarse after 10 min of machining. The peak height also increased. After 30 min of machining, the height of the accretion layer was lower than the original surface level, and the peak height decreased. Furthermore, the core roughness value increased. The surface roughness increased within several minutes from the start of electrical discharge coating using a Ti-type semi-sintered compact electrode. In this paper, we report on the temporal change of surface roughness during electrical discharge coating.

Experimental Analysis and Life Prediction of Pitting Failures for Carburized Gear Material

2000 ◽  
Author(s):  
Tomohiro Suzuki ◽  
Kazuyoshi Ogawa ◽  
Shoji Hotta
Keyword(s):  
Surface Roughness ◽  
Shear Stress ◽  
Compressive Stress ◽  
Shot Peening ◽  
Life Prediction ◽  
Residual Compressive Stress ◽  
Layer Surface ◽  
Test Results ◽  
Carburized Gear ◽  
Specific Sliding

Abstract In order to elucidate the mechanism and factors of tooth face pitting, roller tests were carried out. In the tests, the oxidized-nonmartensitic layer, surface roughness, case hardness and residual compressive stress were noted as the material factors, and sliding, oil temperature and viscosity were considered the running condition factors. As a result, the pitting could be classified into two forms according to the crack origin; subsurface origin pitting and surface origin pitting. In the former case, the pitting life coincided with the value estimated from the shear stress and shear strength related to the Vickers hardness. In the latter case, the influence of shot peening could be regarded as the sum of influences due to surface roughness, hardness and residual compressive stress. These factors of shot peening, the existence of the oxidized-nonmartensitic layer and specific sliding determined the life of the surface origin pitting. The life of tooth face pitting could be calculated using these roller test results.

Influence of wet chemical treatments on the evolution of epoxy polymer layer surface roughness for use as a build-up layer

2004 ◽  
Vol 237 (1-4) ◽  
pp. 457-462 ◽  
Author(s):  
Sam Siau ◽  
Alfons Vervaet ◽  
Andre Van Calster ◽  
Ives Swennen ◽  
Etienne Schacht
Keyword(s):  
Surface Roughness ◽  
Epoxy Polymer ◽  
Polymer Layer ◽  
Layer Surface ◽  
Chemical Treatments ◽  
Wet Chemical

scholarly journals Diazirine-based photo-crosslinkers for defect free fabrication of solution processed organic light-emitting diodes

2020 ◽  
Vol 8 (34) ◽  
pp. 11988-11996
Author(s):  
Kaustav Dey ◽  
S. Roy Chowdhury ◽  
Erik Dykstra ◽  
Aleksandr Koronatov ◽  
H. Peter Lu ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Organic Semiconductor ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Layer Surface ◽  
Semiconductor Films ◽  
Solution Processed ◽  
Light Emitting ◽  
Organic Light

Diazirine mediated photocross-linking (365 nm, 15 mins) of organic semiconductor films dramatically reduces the inter-layer surface roughness which results in significant improvement in OLED efficiency.

scholarly journals Optimasi Multirespon Proses Wire-EDM Menggunakan Metode Taguchi Logika Fuzzy

2017 ◽  
Vol 1 (1) ◽  
pp. 6
Author(s):  
Pathya R
Keyword(s):  
Surface Roughness ◽  
Water Flow ◽  
Orthogonal Array ◽  
Recast Layer ◽  
Layer Surface ◽  
Wire Edm ◽  
Off Time ◽  
Wire Feed

Abstrak                Penelitian ini membahas optimasi proses pemesinan wire-EDM multirespon karakteristik menggunakan metode Taguchi dan logika fuzzy. Multirespon yang digunakan pada penelitian ini adalah recast layer dan surface roughness dimana masing-masing mempunyai karakteristik kualitas semakin kecil semakin baik. Pada percobaan ini dilakukan dengan memvariasikan enam parameter proses, yaitu on time, open  voltage, off time, servo voltage, wire feed, dan water flow. Karena setiap parameter proses tersebut memiliki tiga level, maka rancangan percobaan yang digunakan adalah matriks orthogonal array L27. Untuk mengoptimasi kedua karakteristik dari kedua respon digunakan logika fuzzy. Hasil penelitian menunjukkan bahwa karakteristik dari kedua respon tersebut mengalami peningkatan secara efektif dengan metode ini. Parameter proses pemesinan yang secaara signifikan mempengaruhi recast layer dan surface roughness adalah on time, open voltage dan wire feed.Kata kunci: wire-EDM, Taguchi, logika fuzzy, recast layer, surface roughness

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