Anomalous magnetic properties in LaFe11.5Al1.5

Sanjay Sharma; Faizan Ahmad; Ankit Singh; Akhilesh Kumar Patel; Pramod Kumar

doi:10.1039/c9cp06670e

Anomalous magnetic properties in LaFe_11.5Al_1.5

Sanjay Sharma, Faizan Ahmad, Ankit Singh, Akhilesh Kumar Patel, Pramod Kumar

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

We report the magnetic relaxation, DC magnetization, heat capacity, and X-ray powder diffraction studies of a melt-spun LaFe_11.5Al_1.5 compound executed across a temperature range of 5 to 300 K. We have found three magnetic transitions (at temperatures T₁, T₂, and T_ord) in this compound in the zero-field cooled (ZFC) mode, and two magnetic transitions (at T₂ and T_ord) in the field-cooled cooling/warming (FCC/FCW) mode. The ferromagnetic transition (FM) at temperature T₂ indicating hysteresis alludes to a magnetic transition of the first-order (FOT) at lower temperatures. The magnetization study reveals that meta-stable states exist in the low-temperature antiferromagnetically ordered state. Partially reversible behaviour is also observed in the 120-140 K temperature range. The heat capacity data indicates that the magnetic state of this compound is clearly different from that of spin glasses. The magnetocaloric properties of the compound are determined in the form of the isothermal magnetic entropy change (S_M) and the adiabatic temperature change (ΔT_ad) and the utmost values of S_M and T_ad for a field variation of 25 kOe observed were 3.1 J kg^-1 K^-1 and 1.12 K respectively. The relative cooling power (RCP) is ascertained to be 216 J kg^-1 for an enforced field of 25 kOe.

Original language	English
Pages (from-to)	3425-3433
Number of pages	9
Journal	Physical Chemistry Chemical Physics
Volume	22
Issue number	6
DOIs	https://doi.org/10.1039/c9cp06670e
State	Published - 14 Feb 2020
Externally published	Yes

Bibliographical note

Publisher Copyright:
This journal is © the Owner Societies.

Funding

The authors acknowledge the Spintronics and Magnetic Materials Laboratory, IIIT Allahabad and Department of Physics, and IIT Bombay for the preparation, characterization and measurements of the samples. The author PK would like to thank DST-SERB for funding support.

Funders	Funder number
DST-SERB
Spintronics and Magnetic Materials Laboratory
International Institute of Islamic Thought
Indian Institute of Technology Bombay

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10.1039/c9cp06670e

Cite this

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abstract = "We report the magnetic relaxation, DC magnetization, heat capacity, and X-ray powder diffraction studies of a melt-spun LaFe11.5Al1.5 compound executed across a temperature range of 5 to 300 K. We have found three magnetic transitions (at temperatures T1, T2, and Tord) in this compound in the zero-field cooled (ZFC) mode, and two magnetic transitions (at T2 and Tord) in the field-cooled cooling/warming (FCC/FCW) mode. The ferromagnetic transition (FM) at temperature T2 indicating hysteresis alludes to a magnetic transition of the first-order (FOT) at lower temperatures. The magnetization study reveals that meta-stable states exist in the low-temperature antiferromagnetically ordered state. Partially reversible behaviour is also observed in the 120-140 K temperature range. The heat capacity data indicates that the magnetic state of this compound is clearly different from that of spin glasses. The magnetocaloric properties of the compound are determined in the form of the isothermal magnetic entropy change (SM) and the adiabatic temperature change (ΔTad) and the utmost values of SM and Tad for a field variation of 25 kOe observed were 3.1 J kg-1 K-1 and 1.12 K respectively. The relative cooling power (RCP) is ascertained to be 216 J kg-1 for an enforced field of 25 kOe.",

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AU - Sharma, Sanjay

AU - Ahmad, Faizan

AU - Singh, Ankit

AU - Patel, Akhilesh Kumar

AU - Kumar, Pramod

PY - 2020/2/14

Y1 - 2020/2/14

N2 - We report the magnetic relaxation, DC magnetization, heat capacity, and X-ray powder diffraction studies of a melt-spun LaFe11.5Al1.5 compound executed across a temperature range of 5 to 300 K. We have found three magnetic transitions (at temperatures T1, T2, and Tord) in this compound in the zero-field cooled (ZFC) mode, and two magnetic transitions (at T2 and Tord) in the field-cooled cooling/warming (FCC/FCW) mode. The ferromagnetic transition (FM) at temperature T2 indicating hysteresis alludes to a magnetic transition of the first-order (FOT) at lower temperatures. The magnetization study reveals that meta-stable states exist in the low-temperature antiferromagnetically ordered state. Partially reversible behaviour is also observed in the 120-140 K temperature range. The heat capacity data indicates that the magnetic state of this compound is clearly different from that of spin glasses. The magnetocaloric properties of the compound are determined in the form of the isothermal magnetic entropy change (SM) and the adiabatic temperature change (ΔTad) and the utmost values of SM and Tad for a field variation of 25 kOe observed were 3.1 J kg-1 K-1 and 1.12 K respectively. The relative cooling power (RCP) is ascertained to be 216 J kg-1 for an enforced field of 25 kOe.

AB - We report the magnetic relaxation, DC magnetization, heat capacity, and X-ray powder diffraction studies of a melt-spun LaFe11.5Al1.5 compound executed across a temperature range of 5 to 300 K. We have found three magnetic transitions (at temperatures T1, T2, and Tord) in this compound in the zero-field cooled (ZFC) mode, and two magnetic transitions (at T2 and Tord) in the field-cooled cooling/warming (FCC/FCW) mode. The ferromagnetic transition (FM) at temperature T2 indicating hysteresis alludes to a magnetic transition of the first-order (FOT) at lower temperatures. The magnetization study reveals that meta-stable states exist in the low-temperature antiferromagnetically ordered state. Partially reversible behaviour is also observed in the 120-140 K temperature range. The heat capacity data indicates that the magnetic state of this compound is clearly different from that of spin glasses. The magnetocaloric properties of the compound are determined in the form of the isothermal magnetic entropy change (SM) and the adiabatic temperature change (ΔTad) and the utmost values of SM and Tad for a field variation of 25 kOe observed were 3.1 J kg-1 K-1 and 1.12 K respectively. The relative cooling power (RCP) is ascertained to be 216 J kg-1 for an enforced field of 25 kOe.

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