Topic
Colossal magnetoresistance
About: Colossal magnetoresistance is a research topic. Over the lifetime, 3658 publications have been published within this topic receiving 130104 citations.
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01 Jan 1999
TL;DR: In this article, the authors present an analysis of the magnetic properties of polycrystalline magnetite thin films with nano-sized Crystallites and their application in mass storage media.
Abstract: Foreword. Acknowledgments. List of Contributors. Invited Papers: Original Spinel Ferrites for New Mass Storage Media Ph. Tailhades. Ferrite Films Synthesized from Aqueous Solution and Their Applications M. Abe. Magnetic Behaviour of Polycrystalline Magnetite Thin Films with Nano-Sized Crystallites L Nedkov. Hexaferrite and Manganite Films Obtained by Injection-MOCVD Process S. Pignard, H. Vincent, V. Audier, J. Vessel, J. Kreisel, G. Metellus, J.P. Senateur, J. Pierre, J.L. Hazemann. Non-Linear Microwave and Magneto-Optical Properties of Ferrite Films S. Nikitov, Yu.V. Gulyaev, Yu.A. Filimonov. Vortex Pinning and Dynamics in Perovskite Oxides: Thermal Magneto-Transport in the Mixed State M. Ausloos. Magnetoresistance at Interfaces in Submicrometric Manganese Perovskites Ceramics J. Fontcuberta, Ll. Balcells, B. Martinez, X. Obradors. Colossal Magnetoresistance in Manganese Perovskite Films and Multilayers I. Panagiotopoulos, M. Pissas, C. Christides, G. Kallias, V. Psycharis, N. Moutis, D. Niarchos. Strain and Magnetoresistance Anisotropy of Pr0.7Sr0.3MnO3 Ultrathin Films Qi Li, H.S. Wang. Magnetisation Processes in Magnetic Nanostructures S. McVitie, K.J. Kirk. Size and Interface Dependent Magnetic Properties of Encapsulated Metal Clusters D. Zhang, K.J. Klabunde, Ch. Sorensen, G. Hadjipanayis. Magnetic Metal Nanoparticles-Synthesis, Properties, Applications in Magnetic Hard Disks and Some of Their Quantum Size Effects I. Dragieva. Domain Models and the Hall Effect in Thin Magnetic Films L. Vatskitchev. Dielectric Properties and Applications of Strontium Titanate Thin Films for Tunable Electronics X.X. Xi, Hong-Cheng Li, Weidong Si, A.A. Sirenko. Fabrication, Structureand Properties of TL-Based HTS Thin Films J. O'Connor, D. Hyland, A. Jenkins, D. Dew-Hughes, A. Bramley, Ch. Grovenor, M. Goringe. L-Based HTS Devices and Applications A. Jenkins, D. Dew-Hughes. Investigation of Microwave Losses in HTSC Microstrip and Tunable Periodic Coplanar Line Resonators T. Nurgaliev, R.A. Chakalov, Z. Ivanov, A. Spasov, Z. Wu, L.E. Davis. Selected Posters: Thin Films of Oxide Ferrites Produced by Pulsed Laser Deposition P. Atanasov, M. Koleva, R. Tomov, L. Nedkov. Low Temperature Susceptibility Measurements on the Ultrafine Fe3O4 Powders V. Lovchinov, L. Nedkov. Photo-Induced Effect on the Charge-Ordered State with Canted Antiferromagnetic Spin Order in Pr0.65Ca0.35MnO3 O. Yanagisawa, M. Izumi, Wei-Zhi Hu, Kai-Hua Huang, K. Nakanishi, H. Nojima. Low-Field Magnetoresistance Hysteresis of Magnetron Sputtered La0.7Ca0.3MnO3 Thin Films E.S. Vlakhov, K. Doerr, K.-H. Muller, A. Handstein, D. Eckert, K.A. Nenkov, R.I. Chakalov, A.Y. Spasov. An Experimental Study of Stainless Steel Rough Surface Z. Genchev, H. Stoyanov. Time Series Analysis of Microwave Signals: Multifractal Aspects K. Ivanova. Approximate Self-Affinity and Autocovariance Function Models of Ballistic Deposits I. Atanasov, O. Yordanov. XPS Investigation of Oxidation State of CoNBH Nanoparticles V.I. Krastev, P. Stoimenov, S. Stoeva, I. Dragieva, K. Klabunde. Investigation of Device Low Frequency Noise in MW FET DRO R. Kojouharov, I. Angelo, H. Zirath. Precision In-Situ Frequency Trimming Process of Surface Transverse Wave Resonators M. Taslakov, I. Avramov. Deposition and Characterization of One- and Two-Sided YBCO Thin Films for Microwave Devices
30 citations
TL;DR: In this article, epitaxial ferromagnetic manganite films on 45° bicrystal substrates were prepared by pulsed laser ablation and their low and high-field magnetoresistance (MR) was measured as a function of magnetic field, temperature and current.
Abstract: We prepared epitaxial ferromagnetic manganite films on 45° bicrystal substrates by pulsed laser ablation. Their low- and high-field magnetoresistance (MR) was measured as a function of magnetic field, temperature and current. At low temperatures hysteretic changes in resistivity up to 70% due to switching of magnetic domains at the coercitive field are observed. The strongly nonohmic behavior of the current–voltage leads to a complete suppression of the MR effect at high bias currents with the identical current dependence at low and high magnetic fields. We discuss the data in view of tunneling and mesoscale magnetic transport models and propose an explicit dependence of the spin polarization on the applied current in the grain boundary region.
30 citations
TL;DR: In this paper, the intrinsic bandwidth-disorder phase diagram of half-doped layered manganites with a two-dimensional (2D) Mn-O network was established for the parent state of the colossal magnetoresistance phenomenon in crystals without ferromagnetic instability.
Abstract: Phase diagrams in the plane of ${r}_{A}$ (the average ionic radius, related to the one-electron bandwidth $W$) and ${\ensuremath{\sigma}}^{2}$ (the ionic radius variance, measuring the quenched disorder), or bandwidth-disorder phase diagrams, have been established for perovskite manganites, with a three-dimensional (3D) Mn-O network. Here we establish the intrinsic bandwidth-disorder phase diagram of half-doped layered manganites with a two-dimensional (2D) Mn-O network, examining in detail the parent state of the colossal magnetoresistance phenomenon in crystals without ferromagnetic instability. The consequences of the reduced dimensionality, from 3D to 2D, for the order-disorder phenomena in the charge-orbital sectors are also highlighted.
30 citations
TL;DR: This work reports the chemical solution (water-based) synthesis of high-quality epitaxial thin films of LaMnO3, free of defects at square-centimeter scales, and compatible with standard microfabrication techniques.
Abstract: Hole-doping into the Mott insulator LaMnO3 results in a very rich magneto-electric phase diagram, including colossal magnetoresistance and different types of charge and orbital ordering. On the other hand, LaMnO3 presents an important catalytic activity for oxygen reduction, which is fundamental for increasing the efficiency of solid-oxide fuel cells and other energy-conversion devices. In this work, we report the chemical solution (water-based) synthesis of high-quality epitaxial thin films of LaMnO3, free of defects at square-centimeter scales, and compatible with standard microfabrication techniques. The films show a robust ferromagnetic moment and large magnetoresistance at room temperature. Through a comparison with films grown by pulsed laser deposition, we show that the quasi-equilibrium growth conditions characteristic of this chemical process can be exploited to tune new functionalities of the material.
30 citations
TL;DR: In this paper, the authors report magnetotransport studies on La 0.67Sr 0.33MnO3 trilayer trilayers, fabricated using 90° off-axis sputtering.
Abstract: We report magnetotransport studies on La0.67Sr0.33MnO3/SrTiO3/La0.67Sr0.33MnO3 trilayer junctions, fabricated using 90° off-axis sputtering. Films were grown on both (001) (LaAlO3)0.3–(Sr2AlTaO6)0.7 and (110) NdGaO3 substrates. The sputtered trilayers show improved junction resistance uniformity over those made using pulsed laser deposition. Cross-sectional transmission electron microscopy and atomic force microscopy studies confirm smooth interfaces and a uniform barrier. Magnetoresistances up to ∼100% are observed for junctions on (001) (LaAlO3)0.3–(Sr2AlTaO6)0.7 with a 30 A barrier at 13 K and around 100 Oe. Junction magnetoresistance versus magnetic field behavior is more stable, indicating improved transport and magnetic homogeneity across the junction.
30 citations