Spin fluctuations, geometrical size effects, and zero-field topological order in textured MnSi thin films

Size effects and structural modifications in amorphous TiO2 films deposited by atomic layer deposition (ALD) were investigated. As with the previously investigated ALD-deposited Al2O3 system we found that the film’s...

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Characterization of Epitaxial Superconducting YBacuO Thin Films with Three Different Orientations

MRS Proceedings ◽

10.1557/proc-169-679 ◽

1989 ◽

Vol 169 ◽

Author(s):

X.K. Wang ◽

D.X. Li ◽

S.N. Song ◽

J.Q. Zheng ◽

R.P.H. Chang ◽

...

Keyword(s):

Thin Films ◽

Critical Current Density ◽

Critical Current ◽

Current Density ◽

Orientation Dependence ◽

Zero Field ◽

Epitaxial Thin Films ◽

Oriented Film ◽

Zero Resistance ◽

Xrd Patterns

AbstractEpitaxial thin films of YBaCuO were prepared by multilayer deposition from Y, Cu, and BaF2 sources with: (1) the a‐axis perpendicular to (100)SrTiO3; (2) the c‐axis perpendicular to (100)SrTiO3; and (3) the [110] axis perpendicular to (110)SrTiO3. XRD patterns as well as SEM and HREM images confirm that the films are highly oriented, essentially epitaxial. Both the a‐axis oriented and the c‐axis oriented films exhibit zero resistance at 91K. The [110] oriented film shows the sharpest transiton with a transition width of IK and zero resistance at 85K. The zero field critical current density, Jc, determined magnetically, is in excess of 107A/cm2 at 4.4K and 1.04 x 106A/cm2 at 77K for the c‐axis oriented film; for the a‐axis oriented film we obtained 6.7 x 106A/cm2 at 4.4K and 1.2 x 105A/cm2 at 77K. The orientation dependence of the critical current density in the basal plane of the a‐axis oriented film was studied. The largest Jc's occur along the in‐plane <100> axes of the substrate.

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Preparation and Properties of Superconducting thin Films by Excimer Laser Ablation

MRS Proceedings ◽

10.1557/proc-191-147 ◽

1990 ◽

Vol 191 ◽

Author(s):

Michael E. Geusic ◽

Alan F. Stewart ◽

Larry R. Pederson ◽

William J. Weber ◽

Kenneth R. Marken ◽

...

Keyword(s):

Thin Films ◽

Laser Ablation ◽

Excimer Laser ◽

Laser Energy ◽

Substrate Surface ◽

Xrd Analysis ◽

Zero Field ◽

Superconducting Transition ◽

X Ray Diffraction ◽

Excimer Laser Ablation

ABSTRACTExcimer laser ablation with an in situ heat treatment was used to prepare high quality superconducting YBa2Cu3O7−x thin films on (100)-SrTiO3 and (100)-LaAlO3 substrates. A pulsed excimer laser (XeCl; 308 nm) was used to ablate a rotating, bulk YBa2Cu3O7−x target at a laser energy density of 2–3 J/cm2. Based on four-probe dc resistance measurements, the films exhibited superconducting transition temperatures (Tc, midpoint) of 88 and 87K with 2K (90–10%) transition widths for SrTiO3 and LaAlO3, respectively. Transport critical current densities (Jc) measured at 77K were 2 × 106 and 1 × 106 A/cm2 in zero field for SrTiO3 and LaAlO3, respectively. X-ray diffraction (XRD) analysis showed the films to be highly oriented, with the c-axis perpendicular to the substrate surface.

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Phase Transformations in Au-Fe Particles and Thin Films: Size Effects at the Micro- and Nano-scales

JOM ◽

10.1007/s11837-016-1847-8 ◽

2016 ◽

Vol 68 (5) ◽

pp. 1335-1342 ◽

Cited By ~ 7

Author(s):

Dor Amram ◽

Eugen Rabkin

Keyword(s):

Thin Films ◽

Phase Transformations ◽

Size Effects

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Size effects on the optimization of the mechanical resistance and the electrical conductivity of Cu thin films

Materials Today Communications ◽

10.1016/j.mtcomm.2021.102572 ◽

2021 ◽

pp. 102572

Author(s):

Simón Roa ◽

Martín Sirena

Keyword(s):

Thin Films ◽

Electrical Conductivity ◽

Size Effects ◽

Mechanical Resistance

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Anomalous Hall effect and spin fluctuations in ionic liquid gated SrCoO3 thin films

Physical Review B ◽

10.1103/physrevb.97.184433 ◽

2018 ◽

Vol 97 (18) ◽

Cited By ~ 9

Author(s):

Ding Zhang ◽

Hiroaki Ishizuka ◽

Nianpeng Lu ◽

Yujia Wang ◽

Naoto Nagaosa ◽

...

Keyword(s):

Thin Films ◽

Ionic Liquid ◽

Hall Effect ◽

Anomalous Hall Effect ◽

Spin Fluctuations

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Influence of Electron-Beam Annealing Duration on MgB2 Film Superconductivity

Materials Science Forum ◽

10.4028/www.scientific.net/msf.745-746.255 ◽

2013 ◽

Vol 745-746 ◽

pp. 255-260

Author(s):

Xiang Dong Kong ◽

Qian Dai ◽

Han Li ◽

Qing Rong Feng ◽

Ming Zhang Chu ◽

...

Keyword(s):

Thin Films ◽

Electron Beam ◽

High Efficiency ◽

Beam Current ◽

Annealing Duration ◽

Zero Field ◽

Superconducting Properties ◽

Dense Structure ◽

Novel Method ◽

The Relationship

A novel method to fabricate Magnesium diboride ( MgB2) film by electron beam annealing was presented. The MgB2 thin films could be prepared in a second or sub-second without any toxic diborane gas, extra Mg vapor or argon gas. The method has the advantages of short formation time and high efficiency. Based on this, the relationship between MgB2 conductivity and electron beam annealing duration was investigated experimentally with an accelerating voltage of 40 × 103 V, a beam current of 3×103 A and different annealing durations of 0.1796s, 1860s, 0.2108s, 0.2200s and 0.2332s. The experimental results showed the MgB2 film with 0.2200s has the highest Tconset , the most dense structure and the strongest diamagnetic signal. Its zero-field Jc at 5 K was 5.0 × 106 A/cm2. Also the variation of the film superconducting properties with the annealing duration was found, it will provide an important reference for the preparation of high-quality MgB2 thin films.

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Crystallization of Epitaxial Lanthanum Aluminate and Spinel Thin Films Derived from Nitrate Precursors

MRS Proceedings ◽

10.1557/proc-341-145 ◽

1994 ◽

Vol 341 ◽

Cited By ~ 2

Author(s):

Man Fai Ng ◽

Michael J. Cima

Keyword(s):

Thin Films ◽

Epitaxial Film ◽

Amorphous Film ◽

Zero Field ◽

Epitaxial Thin Films ◽

Lanthanum Aluminate ◽

Initial Nucleation ◽

Metalorganic Deposition ◽

Current Densities ◽

Higher Temperature

AbstractBoth lanthanum aluminate (LaAIO 3) and spinel (MgAl2O 4) epitaxial thin films have been deposited on either planar and stepped (100) SrTiO3 single crystal substrates by pyrolysis of mixed nitrate precursors. The precursors pyrolyze initially into amorphous films. Nucleation of lanthanum aluminate and spinel occurs at the filnVsubstrate interface at higher temperature. Crystallization of LaAlO3 on SrTiO3 substrates occurs at approximately 650°C, whereas nucleation occurs at approximately 800'C without lattice-matched substrates. Similarly, latticematched substrates reduce the crystallization temperature of spinel to below 700°C. The epitaxial film grows at the expense of the amorphous film after the initial nucleation at the interface. The rapid growth and volume change due to the crystallization leave behind an epitaxial film with nanoporosity of 15 to 30 nm. Nevertheless, the surfaces of these films have roughness of only 6–9 Å. Ba2Ycu3O7-x films derived from metalorganic deposition of metal trifluoroacetate precursors was deposited on these epitaxial LaAlO3 films on both planar and stepped SrTiO3 substrates. The resultant YBCO films on LaAlO3 film on planar SrTiO3 substrate have critical current densities of > 2 × 106 A/cm2 at 77K and zero field.

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Iron-Doped Lithium Tantalate Thin Films Deposited by Magnetron Sputtering: A Study of the Iron Role in the Structure and the Derived Magnetic Properties

Crystals ◽

10.3390/cryst10010050 ◽

2020 ◽

Vol 10 (1) ◽

pp. 50 ◽

Cited By ~ 2

Author(s):

Sergio David Villalobos Mendoza ◽

José Trinidad Holguín Momaca ◽

José Trinidad Elizalde Galindo ◽

Diana María Carrillo Flores ◽

Sion Federico Olive Méndez ◽

...

Keyword(s):

Thin Films ◽

Magnetron Sputtering ◽

Magnetic Hysteresis ◽

Hysteresis Loops ◽

Blocking Temperature ◽

Ferromagnetic Behavior ◽

Zero Field ◽

Cooling Curves ◽

X Ray Diffraction ◽

Field Cooling

Fe-doped LiTaO3 thin films with a low and high Fe concentration (labeled as LTO:Fe-LC and LTO:Fe-HC, respectively) were deposited by magnetron sputtering from two home-made targets. The dopant directly influenced the crystalline structure of the LiTaO3 thin films, causing the contraction of the unit cell, which was related to the incorporation of Fe3+ ions into the LiTaO3 structure, which occupied Li positions. This substitution was corroborated by Raman spectroscopy, where the bands associated with Li-O bonds broadened in the spectra of the samples. Magnetic hysteresis loops, zero-field cooling curves, and field cooling curves were obtained in a vibrating sample magnetometer. The LTO:Fe-HC sample demonstrates superparamagnetic behavior with a blocking temperature of 100 K, mainly associated with the appearance of Fe clusters in the thin film. On the other hand, a room temperature ferromagnetic behavior was found in the LTO:Fe-LC layer where saturation magnetization (3.80 kAm−1) and magnetic coercivities were not temperature-dependent. Moreover, the crystallinity and morphology of the samples were evaluated by X-ray diffraction and scanning electron microscopy, respectively.

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