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Toyoki K, Kitaguchi D, Shiratsuchi Y, Nakatani R. Influence of long- and short-range chemical order on spontaneous magnetization in single-crystalline Fe 0.6Al 0.4compound thin films. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2023; 36:135805. [PMID: 38112082 DOI: 10.1088/1361-648x/ad16ac] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Accepted: 12/18/2023] [Indexed: 12/20/2023]
Abstract
We systematically investigate the long- and short-range chemical order, lattice volume, and spontaneous magnetization in single-crystalline Fe0.6Al0.4compound thin films. The vapor-quenching method based on a molecular beam epitaxy technique is utilized to fabricate the single-crystalline Fe0.6Al0.4compound with the differentB2 long-range order parameterS. Swas varied by the deposition temperatureTd,and it increases with increasingTd. The lattice volumeVdecreased with increasingTd, while the tetragonal distortion, ∼4%, due to epitaxial strain were observed. The changes inSandVwere accompanied with the change in the magnetic moment per Fe,μFe.μFeshowed the monotonic decrease as a function ofSwhereasμFemonotonically increases withV. With considering tetragonal distortion,μFe-Vrelationship has a good agreement with the previous reports. TheμFe-Srelationship showed the steep decrease ofμFearoundS∼ 0.6. In contrast toμFe-Vrelationship,μFe-Srelationship does not match only from ours to previous studies but also among other reports. It implies the statistical number of the nearest-neighbor Fe-Fe bonds, i.e.S, cannot be an enough explanatory parameter. To clarify the structural origin of change inμFe, the short-range order (SRO) parameter inferred from the analysis of superlattice diffractions were introduced. They showed the clear difference for the films with high and lowμFe. The results suggest that the transition from the long- to the SRO state plays the significant role onμFe.
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Affiliation(s)
- Kentaro Toyoki
- Department of Material Science and Engineering, Osaka University, Suita, Osaka 565-0871, Japan
- Spintronics Research Network Division, Institute for Open and Transdisciplinary Research Initiatives, Osaka University, Suita, Osaka 565-0871, Japan
- Center for Spintronics Research Network, Osaka University, Toyonaka, Osaka 560-8531, Japan
| | - Daigo Kitaguchi
- Department of Material Science and Engineering, Osaka University, Suita, Osaka 565-0871, Japan
| | - Yu Shiratsuchi
- Department of Material Science and Engineering, Osaka University, Suita, Osaka 565-0871, Japan
- Spintronics Research Network Division, Institute for Open and Transdisciplinary Research Initiatives, Osaka University, Suita, Osaka 565-0871, Japan
- Center for Spintronics Research Network, Osaka University, Toyonaka, Osaka 560-8531, Japan
| | - Ryoichi Nakatani
- Department of Material Science and Engineering, Osaka University, Suita, Osaka 565-0871, Japan
- Spintronics Research Network Division, Institute for Open and Transdisciplinary Research Initiatives, Osaka University, Suita, Osaka 565-0871, Japan
- Center for Spintronics Research Network, Osaka University, Toyonaka, Osaka 560-8531, Japan
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Hadef F. Synthesis and disordering of B2 TM-Al (TM = Fe, Ni, Co) intermetallic alloys by high energy ball milling: A review. POWDER TECHNOL 2017. [DOI: 10.1016/j.powtec.2017.01.082] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Legarra E, Apiñaniz E, Plazaola F. Study of the structure influence on the magnetism of Fe 70Al 30-xSi xalloys. EPJ WEB OF CONFERENCES 2014. [DOI: 10.1051/epjconf/20147503003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Krifa M, Mhadhbi M, Escoda L, Saurina J, Suñol J, Llorca-Isern N, Artieda-Guzmán C, Khitouni M. Phase transformations during mechanical alloying of Fe–30% Al–20% Cu. POWDER TECHNOL 2013. [DOI: 10.1016/j.powtec.2013.05.015] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Mangler C, Gammer C, Karnthaler H, Rentenberger C. Structural modifications during heating of bulk nanocrystalline FeAl produced by high-pressure torsion. ACTA MATERIALIA 2010; 58:5631-5638. [PMID: 20953414 PMCID: PMC2939753 DOI: 10.1016/j.actamat.2010.06.036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2010] [Revised: 06/16/2010] [Accepted: 06/18/2010] [Indexed: 05/04/2023]
Abstract
The deformation-induced nanostructure developed during high-pressure torsion of B2 long-range ordered FeAl is shown to be unstable upon heating. The structural changes were analyzed using transmission electron microscopy, differential scanning calorimetry and microhardness measurements. Heating up to 220 °C leads to the recurrence of the chemical long-range order that is destroyed during deformation. It is shown that the transition to the long-range-ordered phase evolves in the form of small ordered domains homogeneously distributed inside the nanosized grains. At temperatures between 220 and 370 °C recovery of dislocations and antiphase boundary faults cause a reduction in the grain size from 77 to 35 nm. Grain growth occurs at temperatures above 370 °C. The evolution of the strength monitored by microhardness is discussed in the framework of grain-size hardening and hardening by defect recovery.
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Affiliation(s)
- C. Mangler
- Corresponding author. Fax: +43 1 4277 51316.
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