AN EXPERIMENTAL STUDY ON THE MAGNETIC AND EXCHANGE BIAS PROPERTIES OF SELECTED MN RICH NI-MN-GA BASED HEUSLER ALLOYS

AN EXPERIMENTAL STUDY ON THE MAGNETIC AND EXCHANGE BIAS PROPERTIES OF SELECTED MN RICH NI-MN-GA BASED HEUSLER ALLOYS

Bibliographic Details
Main Author: Albagami, Abdullah Mohamed
Language:English
Published: Miami University / OhioLINK 2016
Subjects:
Physics
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=miami1467158012
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-miami14671580122021-08-03T06:37:07Z AN EXPERIMENTAL STUDY ON THE MAGNETIC AND EXCHANGE BIAS PROPERTIES OF SELECTED MN RICH NI-MN-GA BASED HEUSLER ALLOYS Albagami, Abdullah Mohamed Physics In this Thesis project, an experimental study on the magnetic and exchange bias properties of a series of polycrystalline Ni1.7-xMn1.7+xGa0.6 alloys have been investigated by x-ray diffraction , dc magnetization, and ac susceptibility measurements. X-ray diffraction measurement showed that all prepared samples have a tetragonal L10 martensitic structure at room temperature. Scanning electron microscopy measurements show that the compounds are single phase. With increasing Mn concentration x, the lattice parameters marginally increases. The temperature dependence of magnetization data show two distinct transitions in the alloys. At lower temperatures, a peak in the data is observed while the ferromagnetic to paramagnetic transition occurs at higher temperatures. With increasing Mn concentration, the temperature of both transitions increases. Thermomagnetic irreversibility is observed in the magnetization data of all alloys. The ac susceptibility measurements on the materials show the existence of frequency dependence, which suggest that the thermomagnetic irreversibility in the magnetization data is due to the spin glass like ground state in the alloys. The spin glass like ground state with competing magnetic interactions result in the observation of double-shifted hysteresis loop and exchange bias effects in the alloys. The magnitude of the exchange bias field is strongly dependent on the cooling field. 2016-07-05 English text Miami University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=miami1467158012 http://rave.ohiolink.edu/etdc/view?acc_num=miami1467158012 unrestricted This thesis or dissertation is protected by copyright: some rights reserved. It is licensed for use under a Creative Commons license. Specific terms and permissions are available from this document's record in the OhioLINK ETD Center.
collection NDLTD
language English
sources NDLTD
topic Physics
spellingShingle Physics
Albagami, Abdullah Mohamed
AN EXPERIMENTAL STUDY ON THE MAGNETIC AND EXCHANGE BIAS PROPERTIES OF SELECTED MN RICH NI-MN-GA BASED HEUSLER ALLOYS
author Albagami, Abdullah Mohamed
author_facet Albagami, Abdullah Mohamed
author_sort Albagami, Abdullah Mohamed
title AN EXPERIMENTAL STUDY ON THE MAGNETIC AND EXCHANGE BIAS PROPERTIES OF SELECTED MN RICH NI-MN-GA BASED HEUSLER ALLOYS
title_short AN EXPERIMENTAL STUDY ON THE MAGNETIC AND EXCHANGE BIAS PROPERTIES OF SELECTED MN RICH NI-MN-GA BASED HEUSLER ALLOYS
title_full AN EXPERIMENTAL STUDY ON THE MAGNETIC AND EXCHANGE BIAS PROPERTIES OF SELECTED MN RICH NI-MN-GA BASED HEUSLER ALLOYS
title_fullStr AN EXPERIMENTAL STUDY ON THE MAGNETIC AND EXCHANGE BIAS PROPERTIES OF SELECTED MN RICH NI-MN-GA BASED HEUSLER ALLOYS
title_full_unstemmed AN EXPERIMENTAL STUDY ON THE MAGNETIC AND EXCHANGE BIAS PROPERTIES OF SELECTED MN RICH NI-MN-GA BASED HEUSLER ALLOYS
title_sort experimental study on the magnetic and exchange bias properties of selected mn rich ni-mn-ga based heusler alloys
publisher Miami University / OhioLINK
publishDate 2016
url http://rave.ohiolink.edu/etdc/view?acc_num=miami1467158012
work_keys_str_mv AT albagamiabdullahmohamed anexperimentalstudyonthemagneticandexchangebiaspropertiesofselectedmnrichnimngabasedheusleralloys
AT albagamiabdullahmohamed experimentalstudyonthemagneticandexchangebiaspropertiesofselectedmnrichnimngabasedheusleralloys
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