ENGRI111_22_magneticsII

ENGRI111_22_magneticsII - ENGRI111 Magnetics-II Magnetic...

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ENGRI111 Magnetics-II Magnetic Storage
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Magnetic Write/Read Magnetic Write/Read Inductive Head Magnetoresistive Head 1-Dimensional Tape 2-Dimensional Disk
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State of the Art 100 GB 50 MB/sec 100 miles/hr Few microns between disk and head - sometimes 0.5 microns a smaller gap ensures stronger signal
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Origin Of Magnetic Properties Origin Of Magnetic Properties www.aacg.bham.ac.uk/.../magnetic_recording.htm Spin Moment Orbital Moment
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Ferromagnetic Fe, Ni Antiferromagnetic Cr, Mn Exchange Interaction: acts to align neighboring atoms Parallel: Ferromagnetic Antiparallel: Antiferromagnetic
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Magnetic Domains/Walls Magnetic Domains/Walls Magnetic materials lower their energy by dividing into multiple domains Domains are costly – energy associated with their formation H = 0 H > 0
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Domain Walls Domain Walls www.aacg.bham.ac.uk/.../magnetic_recording.htm Magnetization several orders of magnitude easier because of domain walls
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Magnetization Magnetization H = 0 H > 0 M H M H
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Magnetization Magnetization H >> 0 H >>> 0 M H M H
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Magnetic Hysteresis Loop Magnetic Hysteresis Loop H M Magnetization: not linear Magnetization: not reversible
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