magnetic-properties - Chapter 20- ISSUES TO ADDRESS... How...

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Unformatted text preview: Chapter 20- ISSUES TO ADDRESS... How do we measure magnetic properties ? 1 What are the atomic reasons for magnetism? Materials design for magnetic storage. How are magnetic material classified? CHAPTER 20: MAGNETIC PROPERTIES Chapter 20- 2 Created by current through a coil: Applied magnetic field H current I N turns total L = length of each turn Relation for the applied magnetic field, H : H = NI L applied magnetic field units = (ampere-turns/m) current APPLIED MAGNETIC FIELD Chapter 20- 3 Magnetic induction results in the material current I B = Magnetic Induction (tesla) inside the material Magnetic susceptibility, (dimensionless) H B vacuum = 0 > 0 < 0 measures the material response relative to a vacuum. RESPONSE TO A MAGNETIC FIELD Chapter 20- 4 Measures the response of electrons to a magnetic field. Electrons produce magnetic moments: magnetic moments electron nucleus electron spin Net magnetic moment:--sum of moments from all electrons. Three types of response... Adapted from Fig. 20.4, Callister 6e ....
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magnetic-properties - Chapter 20- ISSUES TO ADDRESS... How...

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