Observation of exchange bias in nanoscale AuFe alloy film
We report on observation of the exchange bias effect in AuFe co-sputtered alloy films in the as-deposited state and following swift heavy ion irradiation. The Mössbauer spectrum for the as-deposited film shows a broad paramagnetic doublet together with a small contribution from hyperfine magnetic se...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2020-01-01
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| Series: | Materials Research Express |
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| Online Access: | https://doi.org/10.1088/2053-1591/aba061 |
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| author | Compesh Pannu Santanu Ghosh Pankaj Srivastava K Bharuth-Ram V R Reddy Ajay Gupta Debdulal Kabiraj D K Avasthi |
| author_facet | Compesh Pannu Santanu Ghosh Pankaj Srivastava K Bharuth-Ram V R Reddy Ajay Gupta Debdulal Kabiraj D K Avasthi |
| author_sort | Compesh Pannu |
| collection | DOAJ |
| description | We report on observation of the exchange bias effect in AuFe co-sputtered alloy films in the as-deposited state and following swift heavy ion irradiation. The Mössbauer spectrum for the as-deposited film shows a broad paramagnetic doublet together with a small contribution from hyperfine magnetic sextets. The magnetization behavior exhibits a spontaneous exchange bias effect at room temperature without application of an external triggering field. The magnitude of exchange bias in the as-deposited sample increases with decreasing temperature, at first gradually down to about 50 K and then more rapidly down to 5 K. Irradiation of AuFe film with 100 MeV Au ^9+ ions transforms the Mössbauer spectrum into a broad magnetic sextet, with asymmetric broadening characteristic of the formation of α-Fe magnetic nanoclusters surrounded by shells of reduced Fe concentration. At room temperature the exchange bias field is in the same sense as that for the as-deposited sample, but decreases with temperature until it reverse its sign at below about 50 K. In both the as-deposited and irradiated samples a well-defined uniaxial magnetic anisotropy, consequent on a stress induced texturing of the Fe precipitate distribution, is observed. |
| first_indexed | 2024-03-12T15:34:42Z |
| format | Article |
| id | doaj.art-b8dc54c036244da8bd178de42aa8b65d |
| institution | Directory Open Access Journal |
| issn | 2053-1591 |
| language | English |
| last_indexed | 2024-03-12T15:34:42Z |
| publishDate | 2020-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Materials Research Express |
| spelling | doaj.art-b8dc54c036244da8bd178de42aa8b65d2023-08-09T16:17:15ZengIOP PublishingMaterials Research Express2053-15912020-01-017707610210.1088/2053-1591/aba061Observation of exchange bias in nanoscale AuFe alloy filmCompesh Pannu0https://orcid.org/0000-0002-3783-555XSantanu Ghosh1https://orcid.org/0000-0002-5518-5837Pankaj Srivastava2https://orcid.org/0000-0001-8063-6209K Bharuth-Ram3V R Reddy4Ajay Gupta5https://orcid.org/0000-0002-4430-6875Debdulal Kabiraj6D K Avasthi7Nanostech Laboratory, Department of Physics, Indian Institute of Technology Delhi , New Delhi–110016, IndiaNanostech Laboratory, Department of Physics, Indian Institute of Technology Delhi , New Delhi–110016, IndiaNanostech Laboratory, Department of Physics, Indian Institute of Technology Delhi , New Delhi–110016, IndiaPhysics Department, Durban University of Technology , Durban–4000, South Africa; School of Chemistry and Physics, University of KwaZulu-Natal , Durban–4041, South AfricaUGC-DAE Consortium for Scientific Research, University Campus , Khandwa Road, Indore–452 017, IndiaAmity Centre for Spintronics Materials, Amity University , Noida, Uttar Pardesh–201313, IndiaInter University Accelerator Centre, New Delhi–110067, IndiaAmity Centre for Advance Research and Innovation, Amity University , Noida, Uttar Pardesh–201313, India; Amity Centre of Accelerator based Fundamental and Applied Research, Amity University , Noida–201313, Uttar Pardesh, IndiaWe report on observation of the exchange bias effect in AuFe co-sputtered alloy films in the as-deposited state and following swift heavy ion irradiation. The Mössbauer spectrum for the as-deposited film shows a broad paramagnetic doublet together with a small contribution from hyperfine magnetic sextets. The magnetization behavior exhibits a spontaneous exchange bias effect at room temperature without application of an external triggering field. The magnitude of exchange bias in the as-deposited sample increases with decreasing temperature, at first gradually down to about 50 K and then more rapidly down to 5 K. Irradiation of AuFe film with 100 MeV Au ^9+ ions transforms the Mössbauer spectrum into a broad magnetic sextet, with asymmetric broadening characteristic of the formation of α-Fe magnetic nanoclusters surrounded by shells of reduced Fe concentration. At room temperature the exchange bias field is in the same sense as that for the as-deposited sample, but decreases with temperature until it reverse its sign at below about 50 K. In both the as-deposited and irradiated samples a well-defined uniaxial magnetic anisotropy, consequent on a stress induced texturing of the Fe precipitate distribution, is observed.https://doi.org/10.1088/2053-1591/aba061magnetizationexchange biasion beam irradiationswift heavy ionsalloys |
| spellingShingle | Compesh Pannu Santanu Ghosh Pankaj Srivastava K Bharuth-Ram V R Reddy Ajay Gupta Debdulal Kabiraj D K Avasthi Observation of exchange bias in nanoscale AuFe alloy film Materials Research Express magnetization exchange bias ion beam irradiation swift heavy ions alloys |
| title | Observation of exchange bias in nanoscale AuFe alloy film |
| title_full | Observation of exchange bias in nanoscale AuFe alloy film |
| title_fullStr | Observation of exchange bias in nanoscale AuFe alloy film |
| title_full_unstemmed | Observation of exchange bias in nanoscale AuFe alloy film |
| title_short | Observation of exchange bias in nanoscale AuFe alloy film |
| title_sort | observation of exchange bias in nanoscale aufe alloy film |
| topic | magnetization exchange bias ion beam irradiation swift heavy ions alloys |
| url | https://doi.org/10.1088/2053-1591/aba061 |
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