Analysis of LMSO - Analysis of La0.67Sr0.33MnO3 by Mag...

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Analysis of La0.67Sr0.33MnO3 by Mag netization(M) vs. Temperature(T) curve Yifeng Li
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Ferromagnetism Spontaneous Magnetization Bloch's Law
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Spontaneous Magnetization Manganese ions 3d orbital unpaired electrons Hund's rules Exchange interaction
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Magnetic domain Exchange interaction Identical atoms Pauli exclusion principle Two Fermions can’t occupy the same quantum state Adjacent atoms overlap Parallel-spin state tends to line up(more stable) Volume of Domain 10 -12 -10 -8
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Field 10 oe ZFC(Zero Field Cooling) FC(Field Cooling)
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ZFC FC Why Moment in ZFC curve and FC curve has reverse Temperature dependence property? Atomic thermal motion Close to O Upon applying the external field, the particles try to align in the direction of the field. But due to low thermal motion and the easy axis is not in the same direction with external field the moments cannot be forced to align along the applied field. H
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As the temperature rises, domain obtains energy The particles gradually orient along the field
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