Electron Microscopy in the Study of Magnetic Materials

1985 ◽  
Vol 43 ◽  
pp. 202-205
Author(s):  
P.J. Grundy
Keyword(s):  
Electron Microscopy ◽  
Magnetic Properties ◽  
Electron Microscope ◽  
Magnetic Materials ◽  
Domain Structure ◽  
Magnetic Domain ◽  
Magnetic Domain Structure ◽  
X Ray ◽  
Lorentz Microscopy ◽  
Structure And Microstructure

The aim of this paper is to highlight in brief two main areas in recent electron microscope studies of magnetic materials. The first is in detailed micromagnetic investigations of a fundamental kind and the second is the observation and characterisation of magnetic properties, magnetic domain structure and microstructure in technically important materials. Detailed quantitative investigations of micromagnetic features have, of necessity, been confined to specialist techniques of Lorentz microscopy (LEM). However, conventional modes of TEM and SEM, and X-ray microanalysis complement the defocussed or Fresnel mode of LEM in giving a detailed characterisation of iragnetic materials. It is in this context that LEM has found the widest application.

Scanning transmission X-ray microscopy study of the stretched magnetic-domain structure of Co/Pt multilayers under an in-plane field

2015 ◽  
Vol 66 (11) ◽  
pp. 1732-1735 ◽  
Author(s):  
Djati Handoko ◽  
Duy-Truong Quach ◽  
Sang-Hyuk Lee ◽  
Je-Ho Shim ◽  
Dong-Hyun Kim ◽  
...  
Keyword(s):  
Domain Structure ◽  
Magnetic Domain ◽  
Microscopy Study ◽  
Magnetic Domain Structure ◽  
X Ray ◽  
Plane Field ◽  
Scanning Transmission

Magnetic Domain Structure of Nanocrystalline Zr18-xHfxCo82 Ribbons: Effect of Hf

2013 ◽  
Vol 1557 ◽  
Author(s):  
Lanping Yue ◽  
I. A. Al-Omari ◽  
Wenyong Zhang ◽  
Ralph Skomski ◽  
D. J. Sellmyer
Keyword(s):  
Magnetic Properties ◽  
Domain Structure ◽  
Structure Refinement ◽  
Magnetic Domain ◽  
Maximum Energy ◽  
Magnetic Domain Structure ◽  
Maximum Energy Product ◽  
Energy Product ◽  
Domain Structures ◽  
Rapidly Solidified

ABSTRACTThe effect of Hf on the permanent magnetism of nanocrystalline Zr18-xHfxCo82 ribbons (x = 0, 2, 4, and 6) was investigated by magnetic properties measurement and magnetic force microscopy (MFM). Emphasis is on the local magnetic domain structures in polycrystalline rapidly solidified Zr18-xHfxCo82 ribbons for four different samples with small fractions of Hf dopants (x ≤ 6). The investigation of the magnetic properties of the Zr18-xHfxCo82 ribbons revealed that all the samples under investigation are ferromagnetic at room temperature, and the corresponding MFM images show bright and dark contrast patterns with up-down magnetic domain structures. It is found that the saturation magnetization and the coercivity depend on Hf doping concentration x in the samples. For a sample with Hf concentration x = 4, the maximum energy product (BH)max value is 3.7 MGOe. The short magnetic correlation length of 131 nm and smallest root-mean-square phase shift value of 0.680 were observed for x = 4, which suggests the refinement of the magnetic domain structure due to weak intergranular exchange coupling in this sample. The above results indicate that suitable Hf addition is helpful for the magnetic domain structure refinement, the coecivity enhancement, and the energy-product improvement of this class of rare-earth-free nanocrystalline permanent-magnet materials.

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