Nonclassical magnetic dynamics and negative exchange bias in Nd₀.₅Sr₀.₅MnO₃ films
The amorphous, nanoclustered, and self-organizing bilayered Nd₀.₅Sr₀.₅MnO₃ films have been prepared by a rf-magnetron sputtering. The amorphous film turn out to be a typical paramagnet with a freely moving of the individual Mn spins, the magnetic properties of which are well described by the Curi...
Збережено в:
| Дата: | 2007 |
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| Автори: | , , , , , , , , , , |
| Формат: | Стаття |
| Мова: | English |
| Опубліковано: |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2007
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| Назва видання: | Физика низких температур |
| Теми: | |
| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/120920 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Nonclassical magnetic dynamics and negative exchange bias in Nd₀.₅Sr₀.₅MnO₃ films / V.G. Prokhorov, G.G. Kaminsky, V.A. Komashko, Y.P. Lee, S.Y. Park, Y.H. Hyun, J.B. Kim, J.S. Park, V.L. Svetchnikov, V.P. Pashchenko, V.A. Khokhlov // Физика низких температур. — 2007. — Т. 33, № 08. — С. 889–896. — Бібліогр.: 25 назв. — англ. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| Резюме: | The amorphous, nanoclustered, and self-organizing bilayered Nd₀.₅Sr₀.₅MnO₃ films have been prepared
by a rf-magnetron sputtering. The amorphous film turn out to be a typical paramagnet with a freely moving
of the individual Mn spins, the magnetic properties of which are well described by the Curie–Weiss approximation.
The nanoclustered film manifests the magnetic properties mimic to the superparamagnetic particles
with a nonclassical magnetic dynamics. Taking into account the unique shape of the hysteresis loops, which
have hysteretic lobes at high magnetic field but are nonhysteretic as the field crosses zero, we suggest that
each particle (nanocluster) is the closure magnetic domain (or magnetic vortex) rather than the single one.
At the same time, the blocked to unblocked transition was observed with increasing temperature similar to
the usual superparamagnet. The self-organizing bilayered film demonstrates a negative exchange bias,
which is typical for the ferromagnet/antiferromagnet hybrid system in spite of that both layers in our case
have a ferromagnetic origin. The magnetic properties of the films are discussed in detail on the base of modern
theoretical models. |
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