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magnetic field imaging

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Image
Published: 15 December 2019
Fig. 13 Magnetic force microscopy images of magnetic recording media. (a) Topography image measured during the first pass of the probe interacting with the hard forces of the surface. (b) Magnetic field image measured during the second pass of the probe More
Image
Published: 01 December 2004
by scanning the magnetic probe at a constant distance from the surface. A force due to the interaction of the magnetic tip with the magnetic field gradient from the sample provides the image. More
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003788
EISBN: 978-1-62708-177-1
.... The article also illustrates the microstructure of different types of soft magnetic material and permanent magnets. bitter technique domain imaging Faraday method Lorentz transmission electron microscopy magnetic force microscopy magnetic materials magnetism magneto-optical Kerr method materials...
Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006336
EISBN: 978-1-62708-179-5
... contact, and are easy to generate. Circular flux lines are typically created by passing current directly through the part or, if the part is hollow, passing current through a central conductor threaded through the part. Circular magnetization generally has higher field strength, better penetration...
Image
Published: 09 June 2014
Fig. 14 Magnetic field generated by a butterfly coil heating a copper plate. The top image shows the effect of adding a magnetic flux concentrating material around the center turns. More
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001473
EISBN: 978-1-62708-173-3
..., which attract the magnetic particles, creating a clearly visible image of the flaw. The method is particularly sensitive to the detection of cracks, where, like penetrants, the particles identify flaws with well-defined features. However, the flux leakage may be absent altogether, if the crack runs...
Image
Published: 01 December 2004
Fig. 16 Basic imaging of domain walls by the Bitter technique for samples with strain free surfaces is shown in this line drawing. (a) Ferrofluid particles collect at domain walls due to the fringe field associated with the magnetization rotation through the wall width and the particle More
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006468
EISBN: 978-1-62708-190-0
... Abstract Magnetic-particle inspection is a method of locating surface and subsurface discontinuities in ferromagnetic materials. This article discusses the applications and advantages and limitations of magnetic-particle inspection. It describes magnetic fields in terms of magnetized ring...
Image
Published: 01 December 2004
Fig. 28 Secondary electron image of a Nd 2 Fe 14 B single crystal grown using flux growth synthesis. Type I magnetic contrast clearly shows the maze pattern domains, typical of these uniaxial materials. The large depth of field, characteristic of scanning electron imaging techniques More
Image
Published: 01 December 2004
Fig. 21 Domain imaging using the Faraday effect for a Gd 0.94 Tb 0.75 Er 1.31 Al 0.5 Fe 4.5 O 12 garnet crystal, grown in a PbO and B 2 O 3 flux at 1300 °C (2370 °F). (a) Magnetic domain structure of 50 μm thick platelet cut parallel to the (111) plane. Black and white areas represent More
Series: ASM Handbook
Volume: 2
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v02.a0001108
EISBN: 978-1-62708-162-7
... producing superconducting magnets. Few large laboratories are now without a superconducting magnet, whether used for physical property measurements, nuclear magnetic resonance (NMR) and other resonance experiments, or for investigations of superconductivity itself. Magnetic resonance imaging (MRI) magnets...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005544
EISBN: 978-1-62708-197-9
... is an advanced three-dimensional modeling, image processing, and measurement software for magnetic resonance imaging, computed tomography, positron emission tomography, microscopy, and scientific and industrial imaging applications. It supports both grayscale and color images stored in DICOM, TIFF, Interfile...
Image
Published: 01 December 2004
Fig. 18 As-cast Fe 80 B 18.3 P 1.7 metallic glass alloy. Complex magnetic domain structure resulting from the residual stress pattern due to rapid-solidification processing. Dark-field imaging and the Bitter powder pattern technique were used to produce this image. Reproduced with permission More
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003155
EISBN: 978-1-62708-199-3
... Abstract Superconductors are materials that exhibit a complete disappearance of electrical resistivity on lowering the temperature below the critical temperature. A superconducting material must exhibit perfect diamagnetism, that is, the complete exclusion of an applied magnetic field from...
Image
Published: 01 December 2004
Fig. 27 Type I magnetic contrast from using a scanning electron microscope. The contrast arises from primary electrons (PE) impinging at normal incidence to the sample and the resulting secondary electrons (SE) changing trajectory due to the Lorentz force produced by the fringing field More
Image
Published: 01 August 2018
from and rigidly bonded to a metal surface from which a shear wave of amplitude, U , is reflected. When reflected from the surface, this shear wave polarized in the x -direction causes the wires to move horizontally with amplitude, U , in the magnetic field, B o . This generates an electric field More
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002363
EISBN: 978-1-62708-193-1
... electrode imaging methods. The article discusses the magnetic techniques that are primarily used as inspection techniques for detecting fatigue cracks in structural components. It details the principles and operation procedures of the liquid penetrant methods, positron annihilation techniques, acoustic...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006475
EISBN: 978-1-62708-190-0
.... Their first use in nondestructive evaluation (NDE) was for components such as waveguides, attenuators, cavities, antennas, and antenna covers (radomes). The interaction of microwave electromagnetic energy with a material involves the effect of the material on the electric and magnetic fields that constitute...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003154
EISBN: 978-1-62708-199-3
... Abstract Premanent magnet refers to solid materials that have sufficiently high resistance to demagnetizing fields and sufficiently high magnetic flux output to provide useful and stable magnetic fields. Permanent magnet materials include a variety of alloys, intermetallics, and ceramics...
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005841
EISBN: 978-1-62708-167-2
... pancake coils. Figure 14 shows the direction of current flow in a butterfly coil and the resulting magnetic field. The coil was modeled heating a copper plate. The top image in Fig. 14 shows the effect of adding a magnetic flux concentrator over the center turns. Figure 15 shows the power density...