Persistent photoinduced magnetization and oxygen non-stoichiometry in La0.9Ca0.1MnO3 films

T. Suominen, H. Huhtinen, S. Majumdar, P. Paturi, V. S. Zakhvalinskii, R. Laiho

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)

Abstract

The influence of thermal annealings on La0.9Ca0.1MnO3 (LCMO) films in oxygen and in vacuum with low hole doping is investigated in the phase separation region where competition between AFM and FM phases is high. Measurements by x-ray diffractometry, atomic force microscopy and magnetometry reveal changes in the lattice parameters and magnetic properties of the films, depending on the oxygen content. All films show magnetic cluster glass properties with similar freezing temperatures of around 45 K. Clearly the highest increase of the magnetization is observed in the films annealed in vacuum. We attribute this effect to trapping of unpaired electrons at oxygen vacancies where they can form rigid self-trapped magnetic polarons in potential wells of local moments. As a result long-range spin distortions with local ferromagnetic order may be realized. In conformity with these results, photoinduced persistent magnetization showing different mechanisms of generation, depending on the method of thermal annealing, is observed.
Original languageEnglish
Article number266001
JournalJournal of Physics: Condensed Matter
Volume21
DOIs
Publication statusPublished - 2009
MoE publication typeA1 Journal article-refereed

Fingerprint

Magnetization
Oxygen
magnetization
oxygen
atomic force microscopy
Vacuum
Annealing
Magnetic films
Polarons
vacuum
annealing
magnetic films
polarons
Oxygen vacancies
Freezing
Phase separation
frequency modulation
freezing
Lattice constants
magnetic measurement

Cite this

Suominen, T. ; Huhtinen, H. ; Majumdar, S. ; Paturi, P. ; Zakhvalinskii, V. S. ; Laiho, R. / Persistent photoinduced magnetization and oxygen non-stoichiometry in La0.9Ca0.1MnO3 films. In: Journal of Physics: Condensed Matter. 2009 ; Vol. 21.
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abstract = "The influence of thermal annealings on La0.9Ca0.1MnO3 (LCMO) films in oxygen and in vacuum with low hole doping is investigated in the phase separation region where competition between AFM and FM phases is high. Measurements by x-ray diffractometry, atomic force microscopy and magnetometry reveal changes in the lattice parameters and magnetic properties of the films, depending on the oxygen content. All films show magnetic cluster glass properties with similar freezing temperatures of around 45 K. Clearly the highest increase of the magnetization is observed in the films annealed in vacuum. We attribute this effect to trapping of unpaired electrons at oxygen vacancies where they can form rigid self-trapped magnetic polarons in potential wells of local moments. As a result long-range spin distortions with local ferromagnetic order may be realized. In conformity with these results, photoinduced persistent magnetization showing different mechanisms of generation, depending on the method of thermal annealing, is observed.",
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Persistent photoinduced magnetization and oxygen non-stoichiometry in La0.9Ca0.1MnO3 films. / Suominen, T.; Huhtinen, H.; Majumdar, S.; Paturi, P.; Zakhvalinskii, V. S.; Laiho, R.

In: Journal of Physics: Condensed Matter, Vol. 21, 266001, 2009.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Persistent photoinduced magnetization and oxygen non-stoichiometry in La0.9Ca0.1MnO3 films

AU - Suominen, T.

AU - Huhtinen, H.

AU - Majumdar, S.

AU - Paturi, P.

AU - Zakhvalinskii, V. S.

AU - Laiho, R.

PY - 2009

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N2 - The influence of thermal annealings on La0.9Ca0.1MnO3 (LCMO) films in oxygen and in vacuum with low hole doping is investigated in the phase separation region where competition between AFM and FM phases is high. Measurements by x-ray diffractometry, atomic force microscopy and magnetometry reveal changes in the lattice parameters and magnetic properties of the films, depending on the oxygen content. All films show magnetic cluster glass properties with similar freezing temperatures of around 45 K. Clearly the highest increase of the magnetization is observed in the films annealed in vacuum. We attribute this effect to trapping of unpaired electrons at oxygen vacancies where they can form rigid self-trapped magnetic polarons in potential wells of local moments. As a result long-range spin distortions with local ferromagnetic order may be realized. In conformity with these results, photoinduced persistent magnetization showing different mechanisms of generation, depending on the method of thermal annealing, is observed.

AB - The influence of thermal annealings on La0.9Ca0.1MnO3 (LCMO) films in oxygen and in vacuum with low hole doping is investigated in the phase separation region where competition between AFM and FM phases is high. Measurements by x-ray diffractometry, atomic force microscopy and magnetometry reveal changes in the lattice parameters and magnetic properties of the films, depending on the oxygen content. All films show magnetic cluster glass properties with similar freezing temperatures of around 45 K. Clearly the highest increase of the magnetization is observed in the films annealed in vacuum. We attribute this effect to trapping of unpaired electrons at oxygen vacancies where they can form rigid self-trapped magnetic polarons in potential wells of local moments. As a result long-range spin distortions with local ferromagnetic order may be realized. In conformity with these results, photoinduced persistent magnetization showing different mechanisms of generation, depending on the method of thermal annealing, is observed.

U2 - 10.1088/0953-8984/21/26/266001

DO - 10.1088/0953-8984/21/26/266001

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JO - Journal of Physics: Condensed Matter

JF - Journal of Physics: Condensed Matter

SN - 0953-8984

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