Electric and Magnetic Properties of ALD-Grown BiFeO3 Films

作者: Benoît Marchand , Pasi Jalkanen , Vladimir Tuboltsev , Marko Vehkamäki , Manjunath Puttaswamy

DOI: 10.1021/ACS.JPCC.5B11583

关键词: Bismuth ferriteAtomic layer depositionFerromagnetismThin filmMagnetizationPhysicsMagnetic domainPolarization densityNanotechnologyCoercivityCondensed matter physics

摘要: The magnetization and electric polarization in thin bismuth ferrite films (BFO) have been under extensive study for high technological potential of single-phase multiferroic materials. Surpassing the antiferromagnetic nature weak magneto-electric coupling bulk BFO has required highly specialized substrates epitaxial growth methods so far. Polycrystalline (50–500 nm thick) were grown by atomic layer deposition (ALD) on technologically simple Pt/SiO2/Si substrates. found to exhibit strong saturating ferromagnetism coercivity at temperatures ranging from cryogenic room temperature even with 500 thick layers, a property which cannot be obtained or BFO. mechanism was associated magnetic domain wall dynamics collapsing helimagnetic spin modulation. properties strongly dependent film thickness. crystallization, compositio...

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