Observation of Magnetic Domain Behavior in Colossal Magnetoresistive Materials With a Magnetic Force Microscope

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Science  27 Jun 1997:
Vol. 276, Issue 5321, pp. 2006-2008
DOI: 10.1126/science.276.5321.2006

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Magnetic domain behavior was imaged in calcium-doped lanthanum manganese trioxide films. Magnetic domains behave differently at temperatures that are well below and near the Curie temperatureT c. At low temperatures the domains are very stable. As temperature rises toward T c, domain-domain interactions become weaker and domains become highly mobile and subject to merging and splitting, yet the domains are still traceable. The contrast (which is a measure of magnetization) and size of domains continuously reduce to zero. The temperature at which the domains disappear agrees with the T c obtained by a macroscopic magnetization measurement. Sample defects such as scratches tend to attract magnetic domains.

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