Vertically Aligned Nanocomposite BaTiO3:YMnO3 Thin Films with Room Temperature Multiferroic Properties toward Nanoscale Memory Devices

2018 ◽  
Vol 1 (6) ◽  
pp. 2509-2514 ◽  
Author(s):  
Xingyao Gao ◽  
Leigang Li ◽  
Jie Jian ◽  
Han Wang ◽  
Meng Fan ◽  
...  
Keyword(s):  
Thin Films ◽  
Room Temperature ◽  
Memory Devices ◽  
Multiferroic Properties ◽  
Vertically Aligned

High resistive state retention in room temperature solution processed biocompatible memory devices for health monitoring applications

MRS Advances ◽  
2019 ◽  
Vol 4 (24) ◽  
pp. 1409-1415
Author(s):  
Akshita Mishra ◽  
Soumen Saha ◽  
Henam Sylvia Devi ◽  
Abhisek Dixit ◽  
Madhusudan Singh
Keyword(s):  
Thin Films ◽  
Health Monitoring ◽  
Room Temperature ◽  
Thermal Evaporation ◽  
Low Cost ◽  
Phosphate Buffer Solution ◽  
Thick Layer ◽  
Resistive State ◽  
Memory Devices ◽  
Monitoring Applications

AbstractWearable and bio-implantable health monitoring applications require flexible memory devices that can be used to locally store body vitals prior to transmission or to support local data processing in distributed smart systems. In recent years, non-volatile resistive random access memories composed of oxide-based insulators such as hafnium oxide and niobium pentoxide have attracted a great deal of interest. Unfortunately, hafnium and niobium are not low-cost materials and may also present health challenges. In this work, we have explored the alternative of using titanium dioxide as the insulating oxide using a low-cost solution-phase deposition process. Aqueous sol deposited thin films were deposited on standard RCA-cleaned commercial thermal silicon dioxide (500 nm) wafer (500 µm). Patterned bottom contacts Cr/Au (∼200/300 Å) using shadow masks were deposited on the substrate using successive DC sputtering, and thermal evaporation, respectively at 5 X 10-6 Torr. A sol was prepared using titanium (IV) butoxide as precursor hydrolysed under water and ethanol to form a colloidal solution (sol) at 50°C under constant stirring. Powder X-Ray Diffraction (PXRD) scans of calcined (from sol at 750°C) nanoparticles show a mixture of anatase and rutile phases, confirming the composition of the material. The sol was slowly cooled to room temperature before being spin coated at low rotational speeds on to the substrate in multiple steps involving several spin coating and drying steps to form a uniform film. Top contacts (Ag) of thickness (∼500 Å) were deposited on the sol-deposited thin films using thermal evaporation. The resulting devices were coated with a thick layer of polydimethylsiloxane (PDMS) using a 10:1 ratio of base elastomer and curing agent respectively. After drying the PDMS, resistance measurements were carried out. A high resistance state was detected prior to electroforming in the air at ∼5 MΩ which remains nearly unchanged (∼4.3 MΩ) when dipped in a ∼7.4 pH phosphate buffer solution (equivalent to human blood’s pH (reference average value ∼7.4 pH)). Unencapsulated devices (UM1) were further characterized in air using a Keithley 4200-SCS semiconductor parameter analyzer in dual sweep mode to observe repeatable hysteresis behavior with a large difference between trace and retrace R-V characteristics (∼50±3% over a pristine device), which compares favorably with recent data in the literature on high-performance sputtered TiO2 memristors. Unchanged retention ratio using biocompatible device materials and encapsulation suggests that these devices can be used for biomedical implantable sensor electronics.

Room-temperature multiferroic properties in 1.5LaFeO3–Bi4Ti3O12 thin films

2017 ◽  
Vol 29 (2) ◽  
pp. 1473-1478
Author(s):  
Linyan Feng ◽  
Jie Su ◽  
Chaojing Lu ◽  
Jin Li ◽  
Li Luo ◽  
...  
Keyword(s):  
Thin Films ◽  
Room Temperature ◽  
Multiferroic Properties

Room-temperature multiferroic properties of Bi4.15Nd0.85Ti3FeO15 thin films prepared by the metal–organic decomposition method

2010 ◽  
Vol 150 (35-36) ◽  
pp. 1646-1649 ◽  
Author(s):  
Fengzhen Huang ◽  
Xiaomei Lu ◽  
Cong Chen ◽  
Weiwei Lin ◽  
Xiaochun Chen ◽  
...  
Keyword(s):  
Thin Films ◽  
Decomposition Method ◽  
Room Temperature ◽  
Multiferroic Properties ◽  
Metal Organic ◽  
Organic Decomposition

scholarly journals Room Temperature Tunable Multiferroic Properties in Sol-Gel-Derived Nanocrystalline Sr(Ti1−xFex)O3−δ Thin Films

Nanomaterials ◽  
2017 ◽  
Vol 7 (9) ◽  
pp. 264 ◽  
Author(s):  
Yi-Guang Wang ◽  
Xin-Gui Tang ◽  
Qiu-Xiang Liu ◽  
Yan-Ping Jiang ◽  
Li-Li Jiang
Keyword(s):  
Thin Films ◽  
Room Temperature ◽  
Sol Gel ◽  
Multiferroic Properties

Multiferroic properties of Dy modified BiFeO3 thin films in comparison with Tb modified BiFeO3 thin films

2007 ◽  
Vol 22 (8) ◽  
pp. 2068-2073 ◽  
Author(s):  
V.R. Palkar ◽  
R. Anisha ◽  
R. Pinto ◽  
S. Bhattacharya
Keyword(s):  
Thin Films ◽  
Room Temperature ◽  
Structural Alignment ◽  
Laser Deposition ◽  
Scanning Probe ◽  
Magnetic Domains ◽  
Multiferroic Properties ◽  
Si Substrates ◽  
Bifeo3 Thin Films ◽  
Polycrystalline Thin Films

Coexistence of ferroelectric and ferromagnetic order parameters was observed at room temperature in Bi0.6Dy0.3La0.1FeO3 thin films grown on Pt/TiO2/SiO2/Si substrates using a pulsed laser deposition technique similar to that for Bi0.6Tb0.3La0.1FeO3. The coexistence of ferroelectric and magnetic domains in specific spatial area of the thin film was also confirmed by scanning probe imaging. As expected, the magnetization values obtained for Bi0.6Dy0.3La0.1FeO3 bulk and thin films were higher than those of Bi0.6Tb0.3La0.1FeO3 bulk and polycrystalline thin films because the magnetic moment of Dy is higher than that of Tb. However, preferentially oriented thin films of Bi0.6Tb0.3La0.1FeO3 exhibit much higher magnetization values. It is speculated that structural alignment caused by stress developed during deposition of these films could be responsible for enhancement in magnetization.

Structural and multiferroic properties of BiFeO3 thin films at room temperature

2004 ◽  
Vol 96 (6) ◽  
pp. 3399-3403 ◽  
Author(s):  
Kwi Young Yun ◽  
Minoru Noda ◽  
Masanori Okuyama ◽  
Hiromasa Saeki ◽  
Hitoshi Tabata ◽  
...  
Keyword(s):  
Thin Films ◽  
Room Temperature ◽  
Multiferroic Properties ◽  
Bifeo3 Thin Films
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