Please wait, while we are loading the content...
| Content Provider | EDP Sciences |
|---|---|
| Author | P. Molho J.L. Porteseil |
| Abstract | We report here on the results of hysteresis loop measurements performed on a polycrystalline Gd toroid in order to study the domain structure (or domain texture) nucleated by cooling down the specimen from a temperature higher than Tc (quenched structure). Those measurements bring to light the strong metastability of such a domain structure. We propose a model, derived from the models of random potential, in which we take into account two possible types of metastability originating from the positions as well as the area of walls. Indeed measurements of the thermal variations of quantities which characterize the hysteresis, performed previously on the same specimen, indicate an increase in the area of domain walls in the neighbourhood of Tc (≈ 20 °C). We assume that after quenching this excess area is still present at the lower temperatures (0 °C). A suitable description of the evolution of the wall area with respect to the amplitude and number of field cycles, as well as a comparison with experimental data, lead to an estimation of the ratio between the wall areas after quenching and demagnetization by a decreasing alternating field (a ratio about 3). From this we deduce the temperature around which the domain structure freezes (ε = (Tc - T)/T c ≈ 2 x 10-4). However, there appear differences between the quenched structure and the alternately demagnetized one, which cannot be accounted for by the single parameter « wall area », and which are presumably topological in nature. |
| Ending Page | 1366 |
| Starting Page | 1355 |
| Page Count | 12 |
| File Format | HTM / HTML PDF |
| ISSN | 03020738 |
| Alternate Webpage(s) | http://dx.doi.org/10.1051/jphys:019850046080135500 |
| Issue Number | 8 |
| Journal | Journal de Physique |
| Volume Number | 46 |
| DOI | 10.1051/jphys:019850046080135500 |
| Language | English |
| Publisher | Société Française de Physique |
| Publisher Date | 1985-08-01 |
| Access Restriction | Subscribed |
| Subject Keyword | demagnetisation ferromagnetic properties of substances gadolinium magnetic domain walls magnetic hysteresis quenching thermal |
| Content Type | Text |
| Resource Type | Article |
| Subject | Engineering |
National Digital Library of India (NDLI) is a virtual repository of learning resources which is not just a repository with search/browse facilities but provides a host of services for the learner community. It is sponsored and mentored by Ministry of Education, Government of India, through its National Mission on Education through Information and Communication Technology (NMEICT). Filtered and federated searching is employed to facilitate focused searching so that learners can find the right resource with least effort and in minimum time. NDLI provides user group-specific services such as Examination Preparatory for School and College students and job aspirants. Services for Researchers and general learners are also provided. NDLI is designed to hold content of any language and provides interface support for 10 most widely used Indian languages. It is built to provide support for all academic levels including researchers and life-long learners, all disciplines, all popular forms of access devices and differently-abled learners. It is designed to enable people to learn and prepare from best practices from all over the world and to facilitate researchers to perform inter-linked exploration from multiple sources. It is developed, operated and maintained from Indian Institute of Technology Kharagpur.
Learn more about this project from here.
NDLI is a conglomeration of freely available or institutionally contributed or donated or publisher managed contents. Almost all these contents are hosted and accessed from respective sources. The responsibility for authenticity, relevance, completeness, accuracy, reliability and suitability of these contents rests with the respective organization and NDLI has no responsibility or liability for these. Every effort is made to keep the NDLI portal up and running smoothly unless there are some unavoidable technical issues.
Ministry of Education, through its National Mission on Education through Information and Communication Technology (NMEICT), has sponsored and funded the National Digital Library of India (NDLI) project.
| Sl. | Authority | Responsibilities | Communication Details |
|---|---|---|---|
| 1 | Ministry of Education (GoI), Department of Higher Education |
Sanctioning Authority | https://www.education.gov.in/ict-initiatives |
| 2 | Indian Institute of Technology Kharagpur | Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project | https://www.iitkgp.ac.in |
| 3 | National Digital Library of India Office, Indian Institute of Technology Kharagpur | The administrative and infrastructural headquarters of the project | Dr. B. Sutradhar bsutra@ndl.gov.in |
| 4 | Project PI / Joint PI | Principal Investigator and Joint Principal Investigators of the project |
Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon |
| 5 | Website/Portal (Helpdesk) | Queries regarding NDLI and its services | support@ndl.gov.in |
| 6 | Contents and Copyright Issues | Queries related to content curation and copyright issues | content@ndl.gov.in |
| 7 | National Digital Library of India Club (NDLI Club) | Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach | clubsupport@ndl.gov.in |
| 8 | Digital Preservation Centre (DPC) | Assistance with digitizing and archiving copyright-free printed books | dpc@ndl.gov.in |
| 9 | IDR Setup or Support | Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops | idr@ndl.gov.in |
|
Loading...
|