Pressure enhanced ferromagnetism and suppressed exchange bias in La 0.9Ba0.1CoO3 cobaltite

I. Fita; R. Puzniak; A. Wisniewski; V. Markovich; I. O. Troyanchuk; Yu G. Pashkevich

doi:10.1063/1.4826268

Pressure enhanced ferromagnetism and suppressed exchange bias in La _0.9Ba_0.1CoO₃ cobaltite

I. Fita, R. Puzniak, A. Wisniewski, V. Markovich, I. O. Troyanchuk, Yu G. Pashkevich

Department of Physics

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Abstract

Pressure effect on magnetic properties of La_0.9Ba _0.1CoO₃ cobaltite, exhibiting the ferromagnetic (FM) cluster-glass behavior and exchange bias (EB) effect at low temperatures, was investigated up to 10 kbar. It was found that an applied pressure increases the temperature T_C^cl ≈ 190 K, below which the FM clusters appear, and enlarges the FM phase volume in the sample. Positive value of dT_C^cl/dP coefficient suggests a wide e_g- electron bandwidth for Co ions sited inside the Ba-rich regions (FM clusters). The EB field H_E increases sharply with decreasing temperature below the spin-glass (SG) like transition temperature T_f ≈ 38 K, in a consequence of the exchange coupling at the FM/SG interfaces. Applied pressure was found to suppress strongly the EB, in particular, H_E reduces by a factor of ∼3 under pressure of 10 kbar at 30 K. It appears that under pressure, H_E varies oppositely to the changes in FM phase volume that is very similar to the behavior observed for phase-separated FM/antiferromagnetic manganites. Overall, the pressure-induced diminution in H_E is explained by considering an increase of the FM cluster size and by concomitant decrease of distance between clusters. The results show that for phase-separated FM/SG cobaltites, the EB effect may be controlled by external pressure.

Original language	English
Article number	153910
Journal	Journal of Applied Physics
Volume	114
Issue number	15
DOIs	https://doi.org/10.1063/1.4826268
State	Published - 21 Oct 2013

ASJC Scopus subject areas

General Physics and Astronomy

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title = "Pressure enhanced ferromagnetism and suppressed exchange bias in La 0.9Ba0.1CoO3 cobaltite",

abstract = "Pressure effect on magnetic properties of La0.9Ba 0.1CoO3 cobaltite, exhibiting the ferromagnetic (FM) cluster-glass behavior and exchange bias (EB) effect at low temperatures, was investigated up to 10 kbar. It was found that an applied pressure increases the temperature TCcl ≈ 190 K, below which the FM clusters appear, and enlarges the FM phase volume in the sample. Positive value of dTCcl/dP coefficient suggests a wide eg- electron bandwidth for Co ions sited inside the Ba-rich regions (FM clusters). The EB field HE increases sharply with decreasing temperature below the spin-glass (SG) like transition temperature Tf ≈ 38 K, in a consequence of the exchange coupling at the FM/SG interfaces. Applied pressure was found to suppress strongly the EB, in particular, HE reduces by a factor of ∼3 under pressure of 10 kbar at 30 K. It appears that under pressure, HE varies oppositely to the changes in FM phase volume that is very similar to the behavior observed for phase-separated FM/antiferromagnetic manganites. Overall, the pressure-induced diminution in HE is explained by considering an increase of the FM cluster size and by concomitant decrease of distance between clusters. The results show that for phase-separated FM/SG cobaltites, the EB effect may be controlled by external pressure.",

author = "I. Fita and R. Puzniak and A. Wisniewski and V. Markovich and Troyanchuk, {I. O.} and Pashkevich, {Yu G.}",

note = "Funding Information: This work was supported in part by the Polish Ministry of Science and Higher Education under a research Project No. N N202 1037 36, by European Fund for Regional Development (Contract No. UDA-POIG.01.03.01-00-058/08-00), and by National Academy of Sciences of Ukraine and the Russian Foundation for Basic Research Grant No. 27-02-12.",

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T1 - Pressure enhanced ferromagnetism and suppressed exchange bias in La 0.9Ba0.1CoO3 cobaltite

AU - Fita, I.

AU - Puzniak, R.

AU - Wisniewski, A.

AU - Markovich, V.

AU - Troyanchuk, I. O.

AU - Pashkevich, Yu G.

N1 - Funding Information: This work was supported in part by the Polish Ministry of Science and Higher Education under a research Project No. N N202 1037 36, by European Fund for Regional Development (Contract No. UDA-POIG.01.03.01-00-058/08-00), and by National Academy of Sciences of Ukraine and the Russian Foundation for Basic Research Grant No. 27-02-12.

PY - 2013/10/21

Y1 - 2013/10/21

N2 - Pressure effect on magnetic properties of La0.9Ba 0.1CoO3 cobaltite, exhibiting the ferromagnetic (FM) cluster-glass behavior and exchange bias (EB) effect at low temperatures, was investigated up to 10 kbar. It was found that an applied pressure increases the temperature TCcl ≈ 190 K, below which the FM clusters appear, and enlarges the FM phase volume in the sample. Positive value of dTCcl/dP coefficient suggests a wide eg- electron bandwidth for Co ions sited inside the Ba-rich regions (FM clusters). The EB field HE increases sharply with decreasing temperature below the spin-glass (SG) like transition temperature Tf ≈ 38 K, in a consequence of the exchange coupling at the FM/SG interfaces. Applied pressure was found to suppress strongly the EB, in particular, HE reduces by a factor of ∼3 under pressure of 10 kbar at 30 K. It appears that under pressure, HE varies oppositely to the changes in FM phase volume that is very similar to the behavior observed for phase-separated FM/antiferromagnetic manganites. Overall, the pressure-induced diminution in HE is explained by considering an increase of the FM cluster size and by concomitant decrease of distance between clusters. The results show that for phase-separated FM/SG cobaltites, the EB effect may be controlled by external pressure.

AB - Pressure effect on magnetic properties of La0.9Ba 0.1CoO3 cobaltite, exhibiting the ferromagnetic (FM) cluster-glass behavior and exchange bias (EB) effect at low temperatures, was investigated up to 10 kbar. It was found that an applied pressure increases the temperature TCcl ≈ 190 K, below which the FM clusters appear, and enlarges the FM phase volume in the sample. Positive value of dTCcl/dP coefficient suggests a wide eg- electron bandwidth for Co ions sited inside the Ba-rich regions (FM clusters). The EB field HE increases sharply with decreasing temperature below the spin-glass (SG) like transition temperature Tf ≈ 38 K, in a consequence of the exchange coupling at the FM/SG interfaces. Applied pressure was found to suppress strongly the EB, in particular, HE reduces by a factor of ∼3 under pressure of 10 kbar at 30 K. It appears that under pressure, HE varies oppositely to the changes in FM phase volume that is very similar to the behavior observed for phase-separated FM/antiferromagnetic manganites. Overall, the pressure-induced diminution in HE is explained by considering an increase of the FM cluster size and by concomitant decrease of distance between clusters. The results show that for phase-separated FM/SG cobaltites, the EB effect may be controlled by external pressure.

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Pressure enhanced ferromagnetism and suppressed exchange bias in La _0.9Ba_0.1CoO₃ cobaltite

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