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Ferromagnetic domain structures and nanoclusters in Nd(1/2)Sr(1/2)MnO3
1Advanced Materials Laboratory (AML), National Institute for Materials Science (NIMS), Tsukuba 305-0044, Japan.
Physical Review Letters
|November 22, 2002
Summary
Researchers observed magnetic domain structures in Nd(1/2)Sr(1/2)MnO3 using low-temperature Lorentz electron microscopy. They noted domain walls appearing at 250 K and a granular image near 140 K, suggesting ferromagnetic nanoclusters.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Magnetism
Background:
- Neodymium strontium manganites (Nd(1/2)Sr(1/2)MnO3) exhibit complex magnetic and electronic properties.
- Understanding magnetic domain structures is crucial for their potential applications.
Purpose of the Study:
- To investigate the magnetic domain structures of Nd(1/2)Sr(1/2)MnO3.
- To correlate domain evolution with temperature and proximity to the charge-ordering transition.
Main Methods:
- Low-temperature Lorentz electron microscopy was employed.
- In-situ temperature control allowed observation of domain dynamics during cooling.
Main Results:
- Magnetic domain walls emerged at 250 K, aligned along [100] and [110] directions.
- Domain volume increased with discontinuous wall motion upon further cooling.
- A granular image, indicative of ferromagnetic nanoclusters within an antiferromagnetic matrix, was observed near 140 K.
Conclusions:
- The study reveals the temperature-dependent evolution of magnetic domain structures in Nd(1/2)Sr(1/2)MnO3.
- The observed granular morphology near the charge-ordering temperature suggests phase coexistence.