electrical magnetic and optical properties of materials

... and ferromagnetism 33 Brief history of Kondo effect 34 Experimental Methods 38 3 Magnetic and electrical transport of Ta0.06Ti0.94O2 39 v Thermopower and magnetic ... application of identification of compounds, there are a large number of reported works on the characterisation of concentration and mobility of free carriers, strain and crystal quality, determination of ... physics point of view, the Kondo is the battle or the interaction between the magnetic defect centers and the free electrons of the non magnetic host materials The electrical resistivity of a pure...

Ngày tải lên: 08/09/2015, 15:20

... investigate the effect of Zn2+ partially substituting for Co2+ in CoFe2O4 nanoparticles (Co1-xZnxFe2O4; x = 0, 0.5, and 1) and shelling with silica on the magnetic and optical properties of the ferrite ... uncoated (a) and coated with silica shell (b) the width of hysteresis loop and the magnetic moment decrease due to the substitution of the magnetic Co element by Zn element which is a non -magnetic ... transformation of the magnetization state from ferromagnetic state to paramagnetic state with the increase of the firing temperature from 400°C to 800°C The Ms and Hc values of the prepared coated and uncoated...

Ngày tải lên: 21/06/2014, 01:20

... in either of the bulk materials However to fully utilize these materials and structures, exploration of the properties, understanding of the underlying mechanisms and novel designs of possible ... Xie, Dr Jiabo Yi, Tom Wijnands, Wentao Xu, Dr Kalon Gopinadhan, Prof Alexander Brinkman, Asst Prof Wei Chen, Prof Ganaphathy Baskaran, Assoc Prof Jun Ding, Asst Prof Andrivo Rusydi, Joost Beukers, ... ELECTRONIC, MAGNETIC AND OPTICAL PROPERTIES OF ATOMICALLY CONTROLLED COMPLEX OXIDE HETEROSTRUCTURES AND INTERFACES XIAO WANG (B.Sc, Shandong University, P.R China) A THESIS SUBMITTED FOR THE DEGREE OF...

Ngày tải lên: 09/09/2015, 10:07

... 3.6 DC electrical and structural properties of Pr0.6Ca0.4Mn0.96B0.04O3 -56 3.7 Magnetocaloric properties of Pr0.6Ca0.4Mn0.96B0.04O3 60 3.8 DC magnetic properties of Pr0.6(Ca, ... 44 3.3 DC magnetic properties of Pr0.6Ca0.4Mn1-xCrxO3 - 47 3.4 Magnetocaloric properties of Pr0.6Ca0.4Mn1-xCrxO3 51 3.5 DC magnetic properties of Pr0.6Ca0.4Mn0.96B0.04O3 ... -71 3.9 DC electrical properties of Pr0.6(Ca, Sr)0.4Mn1-xCrxO3 -75 3.10 Magnetocaloric properties of Pr0.6(Ca, Sr)0.4Mn1-xCrxO3 77 3.11 DC magnetic properties of Pr0.5Ca0.5Mn1-xRuxO3...

Ngày tải lên: 09/09/2015, 17:53

... Magnetocaloric effect and magnetothermopower in xLaxSr0.3MnO3 Sm0.7- 196 6.1.2 Electrical, magnetic and magnetothermal properties of La0.7-xPrxCa0.3MnO3 198 6.1.3 Electrical and thermal ... (b)] and x= 0.5 [(c) and (d)] and x= 0.6 [(e) and (f)] compounds 106 Figure 3.23: Temperature dependence of ′ and ′′ at f = 100 kHz [(a) and (b)] and f = MHz [(c) and (d)] under 0H ... variation, magnetic phase transitions (paramagnetic to ferromagnetic or ferromagnetic to antiferromagnetic or paramagnetic to antiferromagnetic) accompanying the I-M transition, real space ordering of...

Ngày tải lên: 10/09/2015, 09:11

... and magnetic properties of SrRuO3/LaAlO3 (SRO/LAO) superlattices By varying the thickness of SRO layers in the superlattices, we are able to modulate both electrical and magnetic properties of ... lot of people have helped me to further my research and I am grateful to all of them Especially, I would like to sincerely thank my supervisors Prof Ariando and Prof T Venkatesan for educating and ... will ever be indebted to Prof Ariando and Prof T Venkatesan I would like to take this opportunity to thank Prof J M D Coey from Ireland, who has ever been a visiting professor in Nanocore for several...

Ngày tải lên: 10/09/2015, 09:11

... acceptor/donor impurities and is helpful in understanding the optical and electrical performances of the materials We focused on the temperature-dependent PL measurements of various silver-doped ... Programs” of the Ministry of Education, Science and Technology, Korea Author details Electronic Materials Center, Korea Institute of Science and Technology, Seoul 136-791, Korea 2Department of Electrical ... al.: Effects of silver impurity on the structural, electrical, and optical properties of ZnO nanowires Nanoscale Research Letters 2011 6:552 Submit your manuscript to a journal and benefit from:...

Ngày tải lên: 20/06/2014, 22:20

... well-established knowledge of the electrical and optical properties of GaSe thin films, in this paper, we report the results on electrical and optical measurements of amorphous thin films of GaSe nanorods ... frequency doubling and fast optical gating [11] and behaves as an X-ray detector [12] Electronic and optoelectronic properties of GaSe, GaS, and InSe materials indicate the possibilities of realizing ... field of micro/optoelectronics Significant research efforts have been focused to the study of the electrical and optical properties of this compound in thin film formation Since the optimization of...

Ngày tải lên: 21/06/2014, 17:20

... determining the microstructure, magnetic and transport properties of the magnetic oxide thin films (2) A whole picture of the structure and magnetic properties of half metallic magnetite (Fe3O4) ... “Augment of coercivity in nanocrystalline SrRuO3 thin film and its spin glass behavior” Journal of Magnetism and Magnetic Materials (accepted) X.L Huang, Y Yang, J Ding “Structure and magnetic properties ... 300K and 5K 116 XI LIST OF FIGURES Figure 1 The density of state of non -magnetic, ferromagnetic, and half metallic meterials Figure Schematic diagram of Spin filter tunneling Below the TC of...

Ngày tải lên: 09/09/2015, 10:15

... effects of size and shape of Si-nc on the incorporation of group-III (B and Al), group-IV (C and Ge) and group-V (N and P) impurities Single-doping has been investigated both in spherical and faceted-like ... approaching asymptotically the value of the band-gap of the undoped Si-nw This is another indication of how doping can modify the electronic and optical properties of the Si nanostructures Conclusions ... the FE and the electronic properties of the Si-nc are influenced by the insertion of more and more impurities We call this insertion of several impurities multidoping Fig shows how the FE of a large...

Ngày tải lên: 16/03/2014, 15:15

... and the intensity of this peak increases relative to that of UV emission as the length of nanorods increases A similar PL pattern with two emission maxima, yet at much lower energies of 2.8 and ... band gap due to impurities.22b In light of these assignments, we suggest that the UV emission of nanorod samples in this work might correspond to the band-toband transition The blue emission of ... COMMUNICATIONS Comparing the intensities of the (010) and (014) peaks of the sample with those of the bulk W18O49, it was found that the relative intensity of (010) has been dramatically increased...

Ngày tải lên: 20/03/2014, 13:08

Ngày tải lên: 22/03/2014, 11:20

... interaction and we suppose in our studied samples there is canting structure as illustrated in Fig 2, where ϕ is the angle between direction of magnetic moment of A ions and magnetic moment of B1 and ... the spin order and magnetic behavior of samples, the field-cooled (FC) and zero field-cooled (ZFC) magnetization measurements were performed in magnetic field of 20 Oe (Fig ) The FC and ZFC curves ... and MSe from Tab 2, we could determine the canting angle between magnetic moments of B1 and B2 ions in octahedral sublattice We see that canting angle increases with increasing amount of nonmagnetic...

Ngày tải lên: 22/03/2014, 11:20

... pattern (a) and UV–visible optical absorption characteristics (b) of the sea urchin-like ZnO nanostructures Fig SEM images (a,b), TEM image (c), HRTEM image (d) and SAED pattern (e) of the sea ... the difference of cell configurations and the quality of the dye However, in the same condition, the conversion efficiency of sea urchin-like ZnO nanostructures is superior to that of ZnO nanorod ... the well-crystallized particles of prepared ZnO Fig 1b shows the UV–visible optical absorption characteristics of the sea urchin-like ZnO Excitonic absorption peak of the ZnO sample is at about...

Ngày tải lên: 06/05/2014, 13:23

... Thus the control of structural type and composition of bimetallic nanoparticles comprised of Ag and Au have been a subject of considerable interest; and the developed of simple and versatile methods ... the scattering coefficients an and bn, and are function of particle radius, and light wavelength λ (in terms of the Ricatti-Bessel functions) As the absorption band of noble metal nanoparticles ... frequency and intensity of SPR band depend on the size, shape, structure and composition [39,40,45] of the metal nanoparticles While the techniques like TEM, HREM reveal the exact size and shape of...

Ngày tải lên: 04/06/2014, 15:20

... Anomalous optical magnetic shift of self-assembled GaSb/GaAs quantum dots J Appl Phys 2011, 110:013522 Figure AFM and STEM images of GaSb/In0.53Ga0.47As QDs and histogram of the height of GaSb/In0.53Ga0.47As ... InAs/GaSb [16, 17] The reason is that they offer comparatively large bandgap energies and provide a possibility of covering the whole middle and far-infared optical range for photoelectric devices ... measurements were performed for the optical properties of the sample at 20 K using the source of a 532-nm line, and the excitation power is changed from mW to 30 mW Results and discussion In order to...

Ngày tải lên: 20/06/2014, 20:20

... migration of the sputtered atoms, thus forming a denser film with larger grains and lower defects Optical properties The optical transmittance spectra in the wavelength range of 200 to 1,100 nm of ZnS ... designed and carried out the experiments and wrote the first draft of the manuscript JHA analyzed the properties and helped draft the manuscript KNH and KSH detailed the original idea and modified ... temperature [6] Figure shows the plot of (ahν)2 versus hν, where a is the optical absorption coefficient, and hν is the energy of the incident photon The optical band gap (Eg) is calculated from the...

Ngày tải lên: 20/06/2014, 21:20

... XRD pattern can confirm the synthesis of a-Fe2O3–Au and Fe3O4–Au hybrid nanorods Fe3O4–Au and a-Fe2O3–Au hybrid nanorods show the combined magnetic and optical properties, which originate 123 1758 ... the surface of FeOOH nanorods makes the surface smoother and leads to the reduction of the BET surface area In order to confirm the effect of layer-by-layer process on the formation of the uniform ... Infrared spectra of Fe2O3–Au and Fe3O4–Au hybrid nanorods Mr = 1.7 emu g-1; and coercive field, Hc = 50.1 Oe The saturation magnetization of Fe3O4–Au hybrid nanorods is lower than that of bulk Fe3O4...

Ngày tải lên: 21/06/2014, 07:20

... growth angle effect of the films for optical properties The thickness of the ZnO thin films was checked by FE-SEM and was fixed at 100 nm Three growth angles (0°, 15°, and 30°) of the columnar ZnO ... http://www.nanoscalereslett.com/content/7/1/55 (a) Page of 440-746, Republic of Korea 4Department of Electrical Engineering, Seoil University, Seoul, 131-702, Republic of Korea Reflectance (%) 30 Authors’ contributions Y-HJ and WSC participated ... the wavelength range of 400 to 800 nm, and Figure 5b shows the reflectance at 550 nm 50 15 o o o 30 40 30 20 10 200 400 600 800 1000 Wavelength (nm) Figure Optical properties of ZnO films based...

Ngày tải lên: 21/06/2014, 17:20

... GaSb/In0.53Ga0.47As QDs and histogram of the height of GaSb/In0.53Ga0.47As QDs (a) The AFM image of GaSb/In0.53Ga0.47As QDs, (b) histogram of the height of GaSb/In0.53Ga0.47As QDs, and (c) the STEM image of GaSb/In0.53Ga0.47As ... diameter, and height size distribution of GaSb/InGaAs QDs on InP (100) substrate, the AFM and STEM measurements were carried out Figure shows the AFM and STEM images of GaSb/ In0.53Ga0.47 As QDs and ... measurements were performed for the optical properties of the sample at 20 K using the source of a 532-nm line, and the excitation power is changed from mW to 30 mW Results and discussion In order to...

Ngày tải lên: 21/06/2014, 17:20