Ultrasonic study of structural instabilities in nickel induced by magnetic fields
The ultrasonic phase velocity was measured on a high purity nickel single crystal with a bias magnetic field in cooling and heating runs over the interval of temperatures from approximately 100 to 325 K. An evident anomaly of the phase velocity was observed in both branches of the temperature cycle....
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
2008-03-01
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| Series: | Materials Research |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392008000100006 |
| _version_ | 1811302636906872832 |
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| author | Ariel Moreno-Gobbi Daniel Moreno Gabriel Zamir |
| author_facet | Ariel Moreno-Gobbi Daniel Moreno Gabriel Zamir |
| author_sort | Ariel Moreno-Gobbi |
| collection | DOAJ |
| description | The ultrasonic phase velocity was measured on a high purity nickel single crystal with a bias magnetic field in cooling and heating runs over the interval of temperatures from approximately 100 to 325 K. An evident anomaly of the phase velocity was observed in both branches of the temperature cycle. The temperature of the anomaly in the heating run was always greater than that in the cooling run, indicating the presence of a hysteretic mechanism. The observed changes are attributed to dimensional alignment of the nickel single crystal twins which are able to distort the crystalline network. The temperature of the anomalies and its hysteretic behavior depend on the synergy between the direction and strength of the magnetic field, the direction of the ultrasonic wave propagation, the internal friction between the domains and the crystallographic orientation. The frictions between magnetic domains that do not contribute to the velocity anomaly produce a hysteretic loop. The process can be easily inhibited by disorientation of the magnetic field. |
| first_indexed | 2024-04-13T07:32:50Z |
| format | Article |
| id | doaj.art-b9323ce9f61f425c987fa329bb4f99ec |
| institution | Directory Open Access Journal |
| issn | 1516-1439 |
| language | English |
| last_indexed | 2024-04-13T07:32:50Z |
| publishDate | 2008-03-01 |
| publisher | Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol) |
| record_format | Article |
| series | Materials Research |
| spelling | doaj.art-b9323ce9f61f425c987fa329bb4f99ec2022-12-22T02:56:19ZengAssociação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)Materials Research1516-14392008-03-01111313510.1590/S1516-14392008000100006Ultrasonic study of structural instabilities in nickel induced by magnetic fieldsAriel Moreno-GobbiDaniel MorenoGabriel ZamirThe ultrasonic phase velocity was measured on a high purity nickel single crystal with a bias magnetic field in cooling and heating runs over the interval of temperatures from approximately 100 to 325 K. An evident anomaly of the phase velocity was observed in both branches of the temperature cycle. The temperature of the anomaly in the heating run was always greater than that in the cooling run, indicating the presence of a hysteretic mechanism. The observed changes are attributed to dimensional alignment of the nickel single crystal twins which are able to distort the crystalline network. The temperature of the anomalies and its hysteretic behavior depend on the synergy between the direction and strength of the magnetic field, the direction of the ultrasonic wave propagation, the internal friction between the domains and the crystallographic orientation. The frictions between magnetic domains that do not contribute to the velocity anomaly produce a hysteretic loop. The process can be easily inhibited by disorientation of the magnetic field.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392008000100006ultrasoundcrystalline nickelshape memorymagnetism |
| spellingShingle | Ariel Moreno-Gobbi Daniel Moreno Gabriel Zamir Ultrasonic study of structural instabilities in nickel induced by magnetic fields Materials Research ultrasound crystalline nickel shape memory magnetism |
| title | Ultrasonic study of structural instabilities in nickel induced by magnetic fields |
| title_full | Ultrasonic study of structural instabilities in nickel induced by magnetic fields |
| title_fullStr | Ultrasonic study of structural instabilities in nickel induced by magnetic fields |
| title_full_unstemmed | Ultrasonic study of structural instabilities in nickel induced by magnetic fields |
| title_short | Ultrasonic study of structural instabilities in nickel induced by magnetic fields |
| title_sort | ultrasonic study of structural instabilities in nickel induced by magnetic fields |
| topic | ultrasound crystalline nickel shape memory magnetism |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392008000100006 |
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