Properties of Zn1–xCoxO films produced by pulsed laser deposition with fast particle separation

Lotin, A.A.; Novodvorsky, O.A.; Rylkov, V.V.; Zuev, D.A.; Khramova, O.D.; Pankov, M.A.; Aronzon, B.A.; Semisalova, A.S.; Perov, N.S.; Lashkul, A.; Lahderanta, E.; Panchenko, V.Y.

Авторы: Lotin A.A., Novodvorsky O.A., Rylkov V.V., Zuev D.A., Khramova O.D., Pankov M.A., Aronzon B.A., Semisalova A.S., Perov N.S., Lashkul A., Lahderanta E., Panchenko V.Ya
Журнал: Semiconductors
Том: 48
Номер: 4
Год издания: 2014
Издательство: Springer
Местоположение издательства: New York
Первая страница: 538
Последняя страница: 544
DOI: 10.1134/S1063782614040186
Аннотация: The study is concerned with the structural, optical, magnetic, and transport properties of Zn1 – xCoxO (x = 0.05–0.45) films produced on Al2O3 (0001) substrates at a temperature of Ts = 500°C by pulsed laser deposition with fast particle separation. The film thickness is d = 60–300 nm. It is found that the Zn1 – xCoxO ternary alloy retains its wurtzitetype crystal structure up to x = 0.35, if the films are produced at low bufferoxygen pressures (~10–6 Torr). It is established that, in these conditions, the electron concen tration is higher than 1020 cm–3 because of the high density of oxygen donor vacancies. In this case, the films start to exhibit ferromagnetism in the magnetization and the anomalous Hall effect at temperatures above 100 K. The sign of the anomalous Hall effect is found to be positive and opposite to the sign of the normal Hall effect, as occurs in Co metal layers. This is indicative of the cluster nature of ferromagnetism of the Zn1 – xCoxO films. For thin Zn1 – xCoxO layers (d = 60 nm, x = 0.2) in a transverse magnetic field, profound hysteresis of the magnetoresistance is observed, which is indicative of the outofplain easy axis of magneti zation of the films. The magnetic anisotropy is attributed to the structuring of the layers (elongation of mag netic clusters along the growth axis of the films). The structuring can lead to noticeable strengthening of the layer ferromagnetism.
Добавил в систему: Перов Николай Сергеевич

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