Magnetic glass in shape memory alloy : Ni 45 Co 5 Mn 38 Sn 12

The first order martensitic transition in the ferromagnetic shape memory alloy Ni45Co5Mn38Sn12 is also a magnetic transition and has a large field induced effect. While cooling in the presence of a field this first order magnetic martensite transition is kinetically arrested. Depending on the coolin...

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Main Authors: Lakhani, Archana, Chaddah, P., Chen, X., Ramanujan, Raju V.
Other Authors: School of Materials Science & Engineering
Format: Article
Language:English
Published: 2013
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Online Access:https://hdl.handle.net/10356/98062
http://hdl.handle.net/10220/17436
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-980622020-06-01T10:13:53Z Magnetic glass in shape memory alloy : Ni 45 Co 5 Mn 38 Sn 12 Lakhani, Archana Chaddah, P. Chen, X. Ramanujan, Raju V. School of Materials Science & Engineering DRNTU::Engineering::Materials The first order martensitic transition in the ferromagnetic shape memory alloy Ni45Co5Mn38Sn12 is also a magnetic transition and has a large field induced effect. While cooling in the presence of a field this first order magnetic martensite transition is kinetically arrested. Depending on the cooling field, a fraction of the arrested ferromagnetic austenite phase persists down to the lowest temperature as a magnetic glassy state, similar to the one observed in various intermetallic alloys and in half doped manganites. A detailed investigation of this first order ferromagnetic austenite (FM-A) to low magnetization martensite (LM-M) state transition as a function of temperature and field has been carried out by magnetization measurements. Extensive cooling and heating in unequal field (CHUF) measurements and a novel field cooled protocol for isothermal MH measurements (FC–MH) are utilized to investigate the glass like arrested states and show a reverse martensite transition. Finally, we determine a field–temperature (HT) phase diagram of Ni45Co5Mn38Sn12 from various magnetization measurements which brings out the regions where thermodynamic and metastable states coexist in the HT space, clearly depicting this system as a 'magnetic glass'. 2013-11-08T03:41:40Z 2019-12-06T19:50:11Z 2013-11-08T03:41:40Z 2019-12-06T19:50:11Z 2012 2012 Journal Article Lakhani, A., Banerjee, A., Chaddah, P., Chen, X., & Ramanujan, R. V. (2012). Magnetic glass in shape memory alloy : Ni 45 Co 5 Mn 38 Sn 12. Journal of physics : condensed matter, 24(38), 386004-. https://hdl.handle.net/10356/98062 http://hdl.handle.net/10220/17436 10.1088/0953-8984/24/38/386004 en Journal of physics : condensed matter
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic DRNTU::Engineering::Materials
spellingShingle DRNTU::Engineering::Materials
Lakhani, Archana
Chaddah, P.
Chen, X.
Ramanujan, Raju V.
Magnetic glass in shape memory alloy : Ni 45 Co 5 Mn 38 Sn 12
description The first order martensitic transition in the ferromagnetic shape memory alloy Ni45Co5Mn38Sn12 is also a magnetic transition and has a large field induced effect. While cooling in the presence of a field this first order magnetic martensite transition is kinetically arrested. Depending on the cooling field, a fraction of the arrested ferromagnetic austenite phase persists down to the lowest temperature as a magnetic glassy state, similar to the one observed in various intermetallic alloys and in half doped manganites. A detailed investigation of this first order ferromagnetic austenite (FM-A) to low magnetization martensite (LM-M) state transition as a function of temperature and field has been carried out by magnetization measurements. Extensive cooling and heating in unequal field (CHUF) measurements and a novel field cooled protocol for isothermal MH measurements (FC–MH) are utilized to investigate the glass like arrested states and show a reverse martensite transition. Finally, we determine a field–temperature (HT) phase diagram of Ni45Co5Mn38Sn12 from various magnetization measurements which brings out the regions where thermodynamic and metastable states coexist in the HT space, clearly depicting this system as a 'magnetic glass'.
author2 School of Materials Science & Engineering
author_facet School of Materials Science & Engineering
Lakhani, Archana
Chaddah, P.
Chen, X.
Ramanujan, Raju V.
format Article
author Lakhani, Archana
Chaddah, P.
Chen, X.
Ramanujan, Raju V.
author_sort Lakhani, Archana
title Magnetic glass in shape memory alloy : Ni 45 Co 5 Mn 38 Sn 12
title_short Magnetic glass in shape memory alloy : Ni 45 Co 5 Mn 38 Sn 12
title_full Magnetic glass in shape memory alloy : Ni 45 Co 5 Mn 38 Sn 12
title_fullStr Magnetic glass in shape memory alloy : Ni 45 Co 5 Mn 38 Sn 12
title_full_unstemmed Magnetic glass in shape memory alloy : Ni 45 Co 5 Mn 38 Sn 12
title_sort magnetic glass in shape memory alloy : ni 45 co 5 mn 38 sn 12
publishDate 2013
url https://hdl.handle.net/10356/98062
http://hdl.handle.net/10220/17436
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