Optimization of Pr0.9Ca0.1MnO3 thin films and observation of coexisting spin-glass and ferromagnetic phases at low temperature

M. Svedberg, S. Majumdar, H. Huhtinen, P. Paturi, S. Granroth

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Abstract

Optimization of thin films of small bandwidth manganite, Pr1−xCaxMnO3 (for x = 0.1), and their magnetic properties are investigated. Using different pulsed laser deposition (PLD) conditions, several films were deposited from the stoichiometric target material on SrTiO3 (001) substrate and their thorough structural and magnetic characterizations were carried out using x-ray diffraction, atomic force microscopy, x-ray photoelectron spectroscopy (XPS), SQUID magnetometry and ac susceptibility measurements. A systematic investigation shows that irrespective of the growth temperature (between 550 and 750 °C), all the as-deposited films have twin boundaries and magnetic double phases. Post-annealing in partial or full oxygen pressure removes the extra phase and the twin boundaries. Zero-field-cooled magnetization data show an antiferromagnetic to paramagnetic transition at around 100 K whereas the field-cooled magnetization data exhibit a paramagnetic to ferromagnetic transition close to 120 K. However, depending on the oxygen treatments, the saturation magnetization and Curie temperature of the films change significantly. Redistribution of oxygen vacancies due to annealing treatments leading to a change in ratio of Mn3+ and Mn4+ in the films is observed from XPS measurements. Low temperature (below 100 K) dc magnetization of these films shows metamagnetic transition, high coercivity and irreversibility magnetizations, indicating the presence of a spin-glass phase at low temperature. The frequency dependent shift in spin-glass freezing temperature from ac susceptibility measurement confirms the coexistence of spin-glass and ferromagnetic phases in these samples at low temperature.
Original languageEnglish
Article number386005
JournalJournal of Physics: Condensed Matter
Volume23
DOIs
Publication statusPublished - 2011
MoE publication typeA1 Journal article-refereed

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Spin glass
spin glass
Magnetization
Thin films
magnetization
optimization
thin films
Photoelectron spectroscopy
X rays
x ray spectroscopy
oxygen
Temperature
photoelectron spectroscopy
Annealing
Oxygen
magnetic permeability
annealing
SQUIDs
Growth temperature
Oxygen vacancies

Cite this

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title = "Optimization of Pr0.9Ca0.1MnO3 thin films and observation of coexisting spin-glass and ferromagnetic phases at low temperature",
abstract = "Optimization of thin films of small bandwidth manganite, Pr1−xCaxMnO3 (for x = 0.1), and their magnetic properties are investigated. Using different pulsed laser deposition (PLD) conditions, several films were deposited from the stoichiometric target material on SrTiO3 (001) substrate and their thorough structural and magnetic characterizations were carried out using x-ray diffraction, atomic force microscopy, x-ray photoelectron spectroscopy (XPS), SQUID magnetometry and ac susceptibility measurements. A systematic investigation shows that irrespective of the growth temperature (between 550 and 750 °C), all the as-deposited films have twin boundaries and magnetic double phases. Post-annealing in partial or full oxygen pressure removes the extra phase and the twin boundaries. Zero-field-cooled magnetization data show an antiferromagnetic to paramagnetic transition at around 100 K whereas the field-cooled magnetization data exhibit a paramagnetic to ferromagnetic transition close to 120 K. However, depending on the oxygen treatments, the saturation magnetization and Curie temperature of the films change significantly. Redistribution of oxygen vacancies due to annealing treatments leading to a change in ratio of Mn3+ and Mn4+ in the films is observed from XPS measurements. Low temperature (below 100 K) dc magnetization of these films shows metamagnetic transition, high coercivity and irreversibility magnetizations, indicating the presence of a spin-glass phase at low temperature. The frequency dependent shift in spin-glass freezing temperature from ac susceptibility measurement confirms the coexistence of spin-glass and ferromagnetic phases in these samples at low temperature.",
author = "M. Svedberg and S. Majumdar and H. Huhtinen and P. Paturi and S. Granroth",
year = "2011",
doi = "10.1088/0953-8984/23/38/386005",
language = "English",
volume = "23",
journal = "Journal of Physics: Condensed Matter",
issn = "0953-8984",
publisher = "Institute of Physics IOP",

}

Optimization of Pr0.9Ca0.1MnO3 thin films and observation of coexisting spin-glass and ferromagnetic phases at low temperature. / Svedberg, M.; Majumdar, S.; Huhtinen, H.; Paturi, P.; Granroth, S.

In: Journal of Physics: Condensed Matter, Vol. 23, 386005, 2011.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Optimization of Pr0.9Ca0.1MnO3 thin films and observation of coexisting spin-glass and ferromagnetic phases at low temperature

AU - Svedberg, M.

AU - Majumdar, S.

AU - Huhtinen, H.

AU - Paturi, P.

AU - Granroth, S.

PY - 2011

Y1 - 2011

N2 - Optimization of thin films of small bandwidth manganite, Pr1−xCaxMnO3 (for x = 0.1), and their magnetic properties are investigated. Using different pulsed laser deposition (PLD) conditions, several films were deposited from the stoichiometric target material on SrTiO3 (001) substrate and their thorough structural and magnetic characterizations were carried out using x-ray diffraction, atomic force microscopy, x-ray photoelectron spectroscopy (XPS), SQUID magnetometry and ac susceptibility measurements. A systematic investigation shows that irrespective of the growth temperature (between 550 and 750 °C), all the as-deposited films have twin boundaries and magnetic double phases. Post-annealing in partial or full oxygen pressure removes the extra phase and the twin boundaries. Zero-field-cooled magnetization data show an antiferromagnetic to paramagnetic transition at around 100 K whereas the field-cooled magnetization data exhibit a paramagnetic to ferromagnetic transition close to 120 K. However, depending on the oxygen treatments, the saturation magnetization and Curie temperature of the films change significantly. Redistribution of oxygen vacancies due to annealing treatments leading to a change in ratio of Mn3+ and Mn4+ in the films is observed from XPS measurements. Low temperature (below 100 K) dc magnetization of these films shows metamagnetic transition, high coercivity and irreversibility magnetizations, indicating the presence of a spin-glass phase at low temperature. The frequency dependent shift in spin-glass freezing temperature from ac susceptibility measurement confirms the coexistence of spin-glass and ferromagnetic phases in these samples at low temperature.

AB - Optimization of thin films of small bandwidth manganite, Pr1−xCaxMnO3 (for x = 0.1), and their magnetic properties are investigated. Using different pulsed laser deposition (PLD) conditions, several films were deposited from the stoichiometric target material on SrTiO3 (001) substrate and their thorough structural and magnetic characterizations were carried out using x-ray diffraction, atomic force microscopy, x-ray photoelectron spectroscopy (XPS), SQUID magnetometry and ac susceptibility measurements. A systematic investigation shows that irrespective of the growth temperature (between 550 and 750 °C), all the as-deposited films have twin boundaries and magnetic double phases. Post-annealing in partial or full oxygen pressure removes the extra phase and the twin boundaries. Zero-field-cooled magnetization data show an antiferromagnetic to paramagnetic transition at around 100 K whereas the field-cooled magnetization data exhibit a paramagnetic to ferromagnetic transition close to 120 K. However, depending on the oxygen treatments, the saturation magnetization and Curie temperature of the films change significantly. Redistribution of oxygen vacancies due to annealing treatments leading to a change in ratio of Mn3+ and Mn4+ in the films is observed from XPS measurements. Low temperature (below 100 K) dc magnetization of these films shows metamagnetic transition, high coercivity and irreversibility magnetizations, indicating the presence of a spin-glass phase at low temperature. The frequency dependent shift in spin-glass freezing temperature from ac susceptibility measurement confirms the coexistence of spin-glass and ferromagnetic phases in these samples at low temperature.

U2 - 10.1088/0953-8984/23/38/386005

DO - 10.1088/0953-8984/23/38/386005

M3 - Article

VL - 23

JO - Journal of Physics: Condensed Matter

JF - Journal of Physics: Condensed Matter

SN - 0953-8984

M1 - 386005

ER -