Magnetic and transport properties controlled by structural disorder in La₀.₇Ca₀.₃MnO₃ films
The magnetic properties of an amorphous, a partially-disordered, and a lattice-strained crystalline La₀.₇Ca₀.₃MnO₃ film are investigated. It is shown that the amorphous film exhibits Curie- Weiss-type paramagnetism with the effective magnetic moment of 4.2 µB/Mn ion and a small ferromagnetic c...
Gespeichert in:
| Datum: | 2004 |
|---|---|
| Hauptverfasser: | , , , , , |
| Format: | Artikel |
| Sprache: | English |
| Veröffentlicht: |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2004
|
| Schriftenreihe: | Физика низких температур |
| Schlagworte: | |
| Online Zugang: | http://dspace.nbuv.gov.ua/handle/123456789/119849 |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Zitieren: | Magnetic and transport properties controlled by structural disorder in La₀.₇Ca₀.₃MnO₃ films / V.G. Prokhorov, V.A. Komashko, G.G. Kaminsky, V.L. Svetchnikov, Y.P. Lee, S.Y. Park // Физика низких температур. — 2004. — Т. 30, № 9. — С. 938–944. — Бібліогр.: 21 назв. — англ. |
Institution
Digital Library of Periodicals of National Academy of Sciences of Ukraine| Zusammenfassung: | The magnetic properties of an amorphous, a partially-disordered, and a lattice-strained crystalline
La₀.₇Ca₀.₃MnO₃ film are investigated. It is shown that the amorphous film exhibits Curie-
Weiss-type paramagnetism with the effective magnetic moment of 4.2 µB/Mn ion and a small
ferromagnetic contribution governed by the formation of a quasi-two-dimensional crystalline interfacial
inclusions. The crystalline film with nanocrystalline randomly-oriented inclusions demonstrates
a superposition of ferromagnetic (in the crystalline matrix) and superparamagnetic (in the
inclusions) nature. The fitted average size of the superparamagnetic particles in the case of a
Langevin function is coincident with that of the nanocrystalline clusters reveated in high-resolution
electron-microscopy images. An increase in the applied magnetic field leads to a reduction in
the average magnetic moment of superparamagnetic particles, which is due to an enhancement of
the ferromagnetic coupling between the individual randomly-oriented crystallites. The completely
crystalline film undergoes only a ferromagnetic transition with a saturation magnetization at 5 K
of 2.73 µB /Mn ion. |
|---|