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Analysis of Mechanically Milled Exchange Coupled Nanocomposite Permanent Magnets
| Content Provider | Semantic Scholar |
|---|---|
| Author | Mukherjee, Santanu |
| Copyright Year | 2012 |
| Abstract | Nanocomposite permanent magnets have recently evoked wide interest because of their interesting properties. They usually consist of a hard magnetic phase having superior coercivities and a soft magnetic phase having improved values of magnetization and when they are coupled together, we get a permanent magnet with enhanced values of both the parameters and thus can be put to a lot of applications. Also to make this possible we can take advantage of the principle of exchange interaction which has been discussed subsequently in detail. Also the microstructure plays a major role in obtaining good magnetic properties and the microstructure is usually controlled by the cooling rates i.e. the wheel speeds during the melt spinning process as well as heat treatment process i.e. annealing. Both these experimental techniques have been used to study the variation of magnetic properties of Nd12Fe82B6 and Nd10Fe84B6 which were formed using different wheel speeds. They were also annealed to study the changes in their magnetic properties. Mechanical milling was employed to improve the coercivities of the as cast system. The next project was to build a non-rare earth permanent magnet using MnIr-Fe. Mechanical milling and subsequent annealing was used to study the changes in phase and the subsequent improvement in magnetic properties. The principle behind this was the exchange coupling of the antiferromagnetic MnIr alloy with the soft ferromagnetic Iron. ACKNOWLEDGEMENTS Firstly, I would like to take this opportunity to express my deep sense of gratitude to my advisor, Dr. Jeffrey E. Shield for the wonderful way in which he has guided me through my research. He has always been patiently available whenever I have had questions and has motivated me to perform to my best. His encouragement has been the very helpful to me for the completion of this thesis. I would also like to take this opportunity to thank the members of my research group for their continuous support and help. Their cooperation was extremely kind and helpful. I am deeply thankful to Dr. Jayaraman, Farhad, Mak, Hellen, and Pinaki for taking time out from their busy schedules to help me out whenever I needed. Lastly, I must express my deepest regards to my family for constantly being beside me, and my friend who helped me to finish my work. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1042&context=mechengdiss |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
