Muralidhar, Shreyas ; Gräfe, Joachim ; Chen, Yu-Chun ; Etter, Martin ; Gregori, Giuliano ; Ener, Semih ; Sawatzki, Simon ; Hono, Kazuhiro ; Gutfleisch, Oliver ; Kronmüller, Helmut ; Schütz, Gisela ; Goering, Eberhard J. (2017)
Temperature-dependent first-order reversal curve measurements on unusually hard magnetic low-temperature phase of MnBi.
In: Physical Review B, 95 (2)
doi: 10.1103/PhysRevB.95.024413
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
We have performed first-order reversal curve (FORC) measurements to investigate the irreversible magnetization processes in the low-temperature phase of MnBi. Using temperature-dependent FORC analysis, we are able to provide a clear insight into the effects of microstructural parameters such as grain diameter, shape, and surface composition on the coercivity of nucleation hardened permanent magnet MnBi. FORC diagrams of MnBi show a unique broadening and narrowing of the coercive field distribution with increasing temperature. We were able to microscopically identify the reason for this behavior, based on the shift in the single domain critical diameter from nearly 1 to 2 μm, thereby changing the dependence of coercivity with particle size. This is based on a strong increase in the uniaxial anisotropy constant with increasing temperature. Furthermore, the results also give an additional confirmation that the magnetic hardening in low-temperature phase MnBi occurs due to nucleation mechanisms. In our case, we show that temperature-dependent FORC measurements provide a powerful tool for the microscopic understanding of high-performance permanent magnet systems.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2017 |
| Autor(en): | Muralidhar, Shreyas ; Gräfe, Joachim ; Chen, Yu-Chun ; Etter, Martin ; Gregori, Giuliano ; Ener, Semih ; Sawatzki, Simon ; Hono, Kazuhiro ; Gutfleisch, Oliver ; Kronmüller, Helmut ; Schütz, Gisela ; Goering, Eberhard J. |
| Art des Eintrags: | Bibliographie |
| Titel: | Temperature-dependent first-order reversal curve measurements on unusually hard magnetic low-temperature phase of MnBi |
| Sprache: | Englisch |
| Publikationsjahr: | 12 Januar 2017 |
| Verlag: | American Physical Society |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Physical Review B |
| Jahrgang/Volume einer Zeitschrift: | 95 |
| (Heft-)Nummer: | 2 |
| DOI: | 10.1103/PhysRevB.95.024413 |
| Kurzbeschreibung (Abstract): | We have performed first-order reversal curve (FORC) measurements to investigate the irreversible magnetization processes in the low-temperature phase of MnBi. Using temperature-dependent FORC analysis, we are able to provide a clear insight into the effects of microstructural parameters such as grain diameter, shape, and surface composition on the coercivity of nucleation hardened permanent magnet MnBi. FORC diagrams of MnBi show a unique broadening and narrowing of the coercive field distribution with increasing temperature. We were able to microscopically identify the reason for this behavior, based on the shift in the single domain critical diameter from nearly 1 to 2 μm, thereby changing the dependence of coercivity with particle size. This is based on a strong increase in the uniaxial anisotropy constant with increasing temperature. Furthermore, the results also give an additional confirmation that the magnetic hardening in low-temperature phase MnBi occurs due to nucleation mechanisms. In our case, we show that temperature-dependent FORC measurements provide a powerful tool for the microscopic understanding of high-performance permanent magnet systems. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Funktionale Materialien 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 17 Jan 2017 12:44 |
| Letzte Änderung: | 17 Jan 2017 12:44 |
| PPN: | |
| Sponsoren: | We would like to acknowledge the financial support from the Deutsche Forschungsgemeinschaft for the G8 project High Performance Permanent Magnets Sustainable for Next Generation (HPPMSNG). |
| Export: | |
| Suche nach Titel in: | TUfind oder in Google |
 |
Frage zum Eintrag |
Optionen (nur für Redakteure)
 |
Redaktionelle Details anzeigen |
Drucken
Impressum