Solid‐Phase Epitaxial Growth of A‐Site‐Ordered Perovskite Sr 4− x Er x Co 4 O 12− δ : A Room Temperature Ferrimagnetic p‐Type Semiconductor
2015; Wiley; Volume: 1; Issue: 12 Linguagem: Inglês
10.1002/aelm.201500199
ISSN2199-160X
AutoresTakayoshi Katase, H. Takahashi, Tetsuya Tohei, Yuki Suzuki, Michihiko Yamanouchi, Yuichi Ikuhara, Ichiro Terasaki, Hiromichi Ohta,
Tópico(s)Physics of Superconductivity and Magnetism
ResumoThe oxygen‐deficient Sr 4− x Er x Co 4 O 12− δ (SECO), one of the ordered perovskite oxides, is a room‐temperature (RT) ferrimagnetic semiconductor that arises from the A‐site‐ordered structure. Development of such a material can lead to the realization of spintronic heterojunction devices; however, to this point there have been difficulties in achieving the A‐site‐ordered structure in SECO thin films. Here, single‐crystalline film growth of SECO with perfectly aligned A‐site‐ordered structure on (LaAlO 3 ) 0.3 (Sr 2 TaAlO 6 ) 0.7 substrates by solid‐phase epitaxy (SPE) method is demonstrated. The brownmillerite‐type, A‐site‐disordered structure of the as‐grown epitaxial film clearly changes into well‐aligned A‐site‐ordered structure after heat treatment at 1050 °C in air; the aligned ordered structure in the film is clearly visualized at atomic level. This ordering induces ferrimagnetism with Curie temperature ( T c ) ≈310 K and it is found that the SECO film with p‐type semiconductivity exhibits anomalous Hall effect at the temperature up to 300 K, which is suitable for the test bench to demonstrate advanced spintronic heterojunction devices, operating at RT. The present SPE method is expected to serve as a powerful technique for the fabrication of thin films and exploration of potential characteristics of A‐site‐ordered perovskite oxides.
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