Dissertation > Excellent graduate degree dissertation topics show

Fabrication and Magnetic Property of Cu/Ni Multilayered Nanowires

Author: LiWeiXiang
Tutor: ZhangWeiGuo
School: Tianjin University
Course: Applied Chemistry
Keywords: Double bath Electrodeposition Multilayered nanowires Cu / Ni Coercivity Giant magnetoresistance
CLC: TB383.1
Type: Master's thesis
Year: 2007
Downloads: 116
Quote: 0
Read: Download Dissertation

Abstract


Giant magneto- resistive material has a broad application prospects in the field of basic research and applied , has become one of the hotspots of the current academic research . This alternating ferromagnetic metal and non-ferrous metal deposited multilayer nanowire arrays , each ferromagnetic layer can be seen as a single magnetic domain ferromagnetic nanoparticles , so the structure is not only highly ordered , and also to maintain ferromagnetic nanoparticles high-coercive- force characteristic . This article by secondary aluminum anodizing prepared aluminum oxide ( AAO ) template , the pore size of the AAO template by changing the anodizing voltage regulation . AAO template was successfully prepared the Cu , Ni single metal nanowires based on dual-slot DC deposition process within the AAO template obtained highly ordered Cu / Ni multilayer nanowire arrays , using scanning electron microscopy (SEM) and Transmission electron microscopy ( TEM ) Cu / Ni multilayered nanowires were characterized by vibrating sample magnetometer ( VSM ) test multilayered nanowires magnetic and using the four-probe method of Cu / Ni multilayered Nanowires the array of giant magnetoresistance properties were studied . SEM test results show that the Cu / Ni multilayer nanowire surface is smooth, uniform diameter AAO template aperture is basically the same . By selected area electron diffraction ( SAED ) photo shows the multilayered nanowires layer of Cu and Ni single crystal structures . Under TEM observation to the layered structure of Cu / Ni Multilayered Nanowires clear , and by controlling the deposition power can be adjusted for each sub - layer thickness to obtain the wavelength of the type of modulation and the type of sub - layer thickness of the multilayer nanowires . Hysteresis loop test results show that the Cu / Ni multilayer nanowire arrays with perpendicular magnetic anisotropy , external magnetic field perpendicular to the surface of the AAO template , the hysteresis loop squareness ratio Sr ( Mr / Ms ) ( 0.2951 , 0.5167,0.7435,0.6661 ) much larger than the magnetic field parallel to the surface of the template when the squareness ratio ( 0.06824,0.04735,0.01965,0.09133 ) . The paper also examines the modulation wavelength and the diameter of the nanowires on the magnetic properties of the Cu / Ni Multilayered Nanowires , experimental results show that with the increase of the modulation wavelength and the decrease of the diameter of the nanowires , Cu / Ni multilayered nanowires coercive force tended to increase . Measured at room temperature and external magnetic field perpendicular to the film surface , a diameter of approximately 80 nm , a length of about 60 M Cu ( 8 nm ) / Ni ( 40 nm ) multilayered nanowires array of giant magnetoresistance of approximately 25.6%.

Related Dissertations

  1. Electrodeposited Pt Electrode Preparation and Electrocatalytic oxidation of ammonia,O643.3
  2. Study on Belt-type ZnO Photoanode for Dye-sensitized and Quantum-dot Sensitized Solar Cells,TM914.4
  3. Kirkendall Effects of Cu-Ni Couples under High Magnetic Field Conditions,TG146.11
  4. Research of Preparation and Residual Stress of Thin Films Based on the TFDC Theory,TB383.2
  5. Study on Electrodeposition Characterise of Lead on Copper Electrode,O646.54
  6. Al-Si-Cu-Ni-Mg -based alloy pistons strengthening phase of high-temperature,TG146.21
  7. The Fabrication and SERS Research of Cu/Ni Core/Shell Nanocable Arrays,TB383.1
  8. Removal of Nitrate by Electochemical Method,X703
  9. Pulse electro-deposition of Ti -based composite anode materials and their properties,TB331
  10. Electrochemical aptamer sensor,TP212.2
  11. Preparation of the Ⅱ-Ⅵ Metallic Sulfide Nanoparticles by Electrochemical Method and Their Properties,TB383.1
  12. Low concentrations of Cu-Ni-Si alloy microstructure and properties,TG146.1
  13. Investigation on Design and Properties of Cadmium-Free Copper-Based Intermediate Temperature Filler Metals,TG425
  14. Study on the Fabrication and Properties of One-dimensional TiO2 Composite,TB383.1
  15. The Design and Implementation of Intelligent Parking Management System,TP311.52
  16. Perpendicularly magnetized spin valve Preparation and Thermal Stability,O484.43
  17. FePt - based ultrafast spin dynamics of the magnetic thin film research,O484.2
  18. Electrochemical Preparation and Growth Process of PANI Films,TB383.2
  19. Investigation on Cyanide-free Alkaline Copper Electroplating and Eletrochemical Behavior,TQ153
  20. (Nd_ (0.8) Pr_ (0.2)) _ (13.0) Fe_ (80) Nb_1B_6 nano- rare earth permanent magnet material behavior of the coercivity,TM273
  21. Study on 2-octanone Polycondensation and Hydrogenation to Higher Alcohol,TQ223.1

CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials
© 2012 www.DissertationTopic.Net  Mobile