Understanding Magnetic Properties and Principles
Explore the world of magnetism through concepts like magnetic susceptibility, NMR/EPR principles, and magnetic moments. Learn about paramagnetic, diamagnetic, ferromagnetic, and antiferromagnetic materials, as well as the effects of magnetic fields on different substances. Discover how magnetic properties relate to the presence of unpaired electrons and how they can be measured experimentally. Dive into the fascinating realm of magnetic alignment, magnetometers, and flux measurements in this comprehensive guide.
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Presentation Transcript
Magnetism Magnetic Susceptibility Nuclear Magnetic Resonance (NMR) Electron Paramagnetic Resonance (EPR) Hall Probes Magnetoresistors Fluxgate Magnetometers Flux Measurements with Pick Up Coils Magnetic Alignment center and direction
Magnetic Susceptibility Principle Questions you may have include: What are paramagnetic materials? What are diamagnetic materials? What are ferromagnetic materials? What are antiferromagnetic materials? What is supermagnets?
Magnetic Filed Effect diamagnetc Paramagnetic
Magnetic Moments (Susceptibility) Magnetic moment ( ): relates directly to the number of unpaired electrons Microbalance Measures to 5th decimal Susceptibility and magnetic moment can be determined experimentally using a Guoy Balance: For paramagnetic substance, unpaired electrons are attracted by the magnetic field and an apparent increase in mass of the sample occurs when the field is switch on
NMR/EPR Principle A particle with a spin and a magnetic moment precesses around an applied field. The quantum energy levels are split into several discrete levels, depending on the spin of the particle. The energy gap between these levels is proportional to the applied field. A resonant absorption of RF energy occurs at a frequency corresponding to energy gap.
