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Effect of HSMF on Electrodeposited Ni-Fe Membrane-- Crystal Morphology and Magnetism Performance

German-Sino Workshop on EPM, October, 16-19, 2005, Dresden, Germany. Effect of HSMF on Electrodeposited Ni-Fe Membrane-- Crystal Morphology and Magnetism Performance. Yunbo Zhong , Yanling Wen, Zhongming Ren, Kang Deng, Kuangdi Xu

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Effect of HSMF on Electrodeposited Ni-Fe Membrane-- Crystal Morphology and Magnetism Performance

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  1. German-Sino Workshop on EPM, October, 16-19, 2005, Dresden, Germany Effect of HSMF on Electrodeposited Ni-Fe Membrane-- Crystal Morphology and Magnetism Performance Yunbo Zhong, Yanling Wen, Zhongming Ren, Kang Deng, Kuangdi Xu Shanghai Key Laboratory of Modern Metallurgy & Material Processing

  2. Electrochemical Crystallization in HSMF Charge Transfer Influence on mass transport MHD effect  E0 Influence on Surface Diffusion、Necleation、Crystal Growth? H2O Me2+ Surface Diffusion Influence on electron transfer kinetics? Nucleation Crystal Growth Metal Membrane Boundary Layer Bulk Solution

  3. Variation of Free Energy in the process of Electro-deposition of NiFe membrane Magnetic susceptibility (χ) of Ni and Fe atoms are higher than that of other non magnetism atoms The χ data is very lacking, and the magnetism of ions in solution are not very clear

  4. Thermocouple - + Nitrogen Quartz Pipe Fix Block Electrode Heater Electrolyte Heat Insulator Supercon-ductive Coil B Water-cooling Pipe B I B//I Sketch Map of Experimental Equipment PID Temperature Controller B Magnetic Field Center I Nickel Plate B⊥I Copper Foil

  5. Distribution of High Static Magnetic Field

  6. B I Effect of magnetic field on electrodeposited Ni-Fe membrane When I⊥B Magnetic Field Center

  7. 0T 4T 6T 8T 10T 12T SurfaceSEM pictures of NiFe membrane electrodeposited in various magnetic fields(J=4A/dm2)

  8. B 4T 6T 0T 8T 10T 12T Across-section SEM pictures of NiFe membrane electrodeposited in various magnetic fields(J=4A/dm2) ( -electrodeposit growth direction )

  9. (111) (111) (200) (200) (220) (220) Strength ratio of three main peaks: I(111):I(200):I(220)= ( 0T)100:54.3:4.3; (04T)100:24.7:6.2; (06T)100:26.9:6.4; (08T)100:28.8:7.1; (10T)100:28.2:8.4; (12T)100:19.1:6.6 XRD patterns of the NiFe membranes electrodeposited in different magnetic flux density

  10. Crystal Orientation Discussion M －Crystal orientation coefficient； I(hkl) －Measured value of the (hkl) plane diffraction peaks； I0(hkl) －Standard value of the (hkl) plane diffraction peaks in PDF card；

  11. Effect of MFD on Crystal Orientation Coefficient

  12. 0T 6T 10T 12T EDS analysis of the samples electrodeposited in different magnetic fields (Fe wt%= 0T-12.71%; 6T-14.99%; 10T-23.32%; 12T-26.10%.)

  13. The relation between saturation magnetization of the samples and preparation magnetic flux density

  14. B I B//I Effect of magnetic field on electrodeposited Ni-Fe membrane When B//I Magnetic Field Center

  15. 0T 4T 6T 8T 10T 12T SEM pictures of the surface of NiFe membrane electrodeposited in parallel magnetic fields(J=4A/dm2)

  16. 4T 0T 6T 8T 10T 12T B J SEM pictures of the across-section of NiFe membrane electrodeposited in parallel magnetic fields (J=4A/dm2)

  17. XRD patterns of the NiFe membranes electrodeposited in different static magnetic fields (Strength ratio of three main peaks： I(111):I(200):I(220)= (0T)100:41.1:4.5; (6T)100:25.8:6.6; (10T)100:27.2:7.6; (12T)100:26.1:7.4)

  18. Analysis of crystal orientation coefficient of the samples

  19. 6T 0T 10T 12T EDS analysis of the samples electrodeposited in different magnetic fields (Fe wt%= 0T-14.13%; 6T-14.12%; 10T-15.17%; 12T-14.47%.)

  20. The relation between saturation magnetization of the samples and preparation magnetic field

  21. 0T 10T

  22. c a b d e SEM pictures of the surface of NiFe membrane electrodeposited without magnetic field (J= a-1A/dm2; b-2A/dm2; c-3A/dm2; d-4A/dm2; e-6A/dm2)

  23. d a b c e FSEM pictures of the across-section of NiFe membrane electrodeposited without magnetic field (J= a-1A/dm2; b-2A/dm2; c-4A/dm2; d-5A/dm2; e-6A/dm2)

  24. a b c d e f Fig.17-a SEM pictures of the surface of NiFe membrane electrodeposited in 10T static magnetic field (J= a-1A/dm2; b-2A/dm2; c-3A/dm2; d-4A/dm2; e-5A/dm2; f-6A/dm2)

  25. a b d c SEM pictures of the across-section of NiFe membrane electrodeposited in 10T static magnetic field (J= a-2A/dm2; b-3A/dm2; c-4A/dm2; d-6A/dm2)

  26. B I FE FL Sketch Map of Nucleation and Crystal Growth when B⊥I In Homogeneous Magnetic Field Trajectory of Ions Sphere Crystal nucleus Metal atom Hydration Ions Metal Crystal Outer Helmholtz area Trajectory of Ions Boundary Layer Bulk solution (a) 0T (b) B1(B1≠0T) B2(B2≥10T)

  27. Sketch Map of Nucleation and and Crystal Growth when B//I In Homogeneous Magnetic Field Direction of magnetic field (B) Magnetic field Anode Bubble Direction of electric field (I) Initial velocity (v0) Cathode Migration of atoms in Horizontal direction

  28. Electro-depostion of NiFe Membrane in Gradient Magnetic Field +400T2/m 0 -400T2/m

  29. B I B//I Sketch Map of Nucleation and and Crystal Growth when B//I and in Gradient Magnetic Field J B

  30. Conclusions • In HSMF, Strengthened MHD effect may influence the crystal morphology of electrodeposited NiFe membrane remarkably, so do the mass transfer process; • Both perpendicular and parallel magnetic field can make the crystal (111) plane texture reinforced; • The iron contents and the saturation magnetization were increased in perpendicular magnetic field but unchanged in parallel one .

  31. Thank you for your attentions!

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