-
The hysteresis behaviors domain structures and temperature coefficients of coercivity are investigated in Sm(CobalFe0.1 Cu0.1Zr0.033)6.9, which is aged at 810℃ and slowly cooled with a rate of 0.5℃/min, and then quenched at different temperatures. It is found that the demagnetization cures show two steps clearly as the alloys are quenched at 600℃, which means that there should have two pinnings on the domain wall, and its domain structure appears more as a zigzag shape domain, which means that there should be a small gradient of Cu distribution in the 1:5 cell boundary phase and a small domain wall pinning in the cell boundary phase. The maximum domain wall pinning should be at the interface between the 1:5 cell boundary phase and 2:17 cell phase. As the alloys are quenched at a lower temperature, the steps in the demagnetization cures disappear. At the same time, their domain structures become narrower, and show more attached domains, which means that a lower domain wall energy is in the 1:5 cell boundary phase and that the maximum domain wall pinning should be in the center of the 1:5 cell boundary phase. As the maximum domain wall pinning is at the interface between the 1:5 cell boundary phase and 2:17 cell phase, the coercivity will show an abnormal temperature dependence. While as the maximum domain wall pinning is in the center of the 1:5 cell boundary phase, the coercivity will decrease with temperature increasing. As the testing temperature rises to 500℃, the coercivities for all samples nearly come to the same values, and the maximum domain wall pinnings all should come to the interface between the 1:5 cell boundary phase and 2:17 cell phase.
-
Keywords:
- 2:17 type SmCo high temperature magnets /
- hysteresis loop /
- domain structure /
- temperature coefficient of coercivity
[1] Liu J F, Chui T, Dimitrov D, Hadjipanayis G C 1998 Appl. Phys. Lett. 73 3007
[2] Streibl B, Fidler J, Schrefl T 2000 J. Appl. Phys. 87 4765
[3] Gopalan R, Ohkubo T, Hono K 2006 Scri. Mater. 54 1345
[4] Romero S A, de Campos M F, Rechenberg H R, Missell F P 2008 J. Magn. Magn. Mater. 320 e73
[5] Liu J F, Ding Y, Zhang Y, Dimitar D, Zhang F, Hadjipanayis G C 1999 J. Appl. Phys. 85 5660
[6] Rong C B, Zhang H W, Chen R J, Shen B G, He S L, Liu J P 2006 J. Phys. D: Appl. Phys. 39 437
[7] Huang M Q, Turgut Z, Ma B M, Chen Z M, Lee D, Higgins A, Chen C H, Liu S, Chu S Y, Horwath J C, Fingers R T 2008 J. Appl. Phys. 103 07E134
[8] Yan A, Gutfleisch O, Handstein A, Gemming T, Muller K H 2003 J. Appl. Phys. 93 7975
[9] Gopalan R, Hono K, Yan A, Gutfleisch O 2009 Scri. Mater. 60 764
[10] Xiong X Y, Ohkubo T, Koyama T, Ohashi K, Tawara K, Hono K 2004 Acta Mater. 52 737
[11] Gutfleisch O, Müller K H, Khlopkov K, Wolf M, Yan A, Schäfer R, Gemming T, Schultz T 2006 Acta Mater. 54 997
[12] Craik D J, Hill E 1974 Phys. Lett. 48 157
[13] Liu J F, Hadjipanayis G C 1999 J. Magn. Magn. Mater. 195 620
[14] Liu J F, Zhang Y, Dimitrov D, Hadjipanayis G C 1999 J. Appl. Phys. 85 2800
[15] Liu S, Yang J, Doyle G, Potts G, Kuhl G 2000 J. Appl. Phys. 87 6728
[16] Kronmüller H, Goll D 2002 Scri. Mater. 47 545
-
[1] Liu J F, Chui T, Dimitrov D, Hadjipanayis G C 1998 Appl. Phys. Lett. 73 3007
[2] Streibl B, Fidler J, Schrefl T 2000 J. Appl. Phys. 87 4765
[3] Gopalan R, Ohkubo T, Hono K 2006 Scri. Mater. 54 1345
[4] Romero S A, de Campos M F, Rechenberg H R, Missell F P 2008 J. Magn. Magn. Mater. 320 e73
[5] Liu J F, Ding Y, Zhang Y, Dimitar D, Zhang F, Hadjipanayis G C 1999 J. Appl. Phys. 85 5660
[6] Rong C B, Zhang H W, Chen R J, Shen B G, He S L, Liu J P 2006 J. Phys. D: Appl. Phys. 39 437
[7] Huang M Q, Turgut Z, Ma B M, Chen Z M, Lee D, Higgins A, Chen C H, Liu S, Chu S Y, Horwath J C, Fingers R T 2008 J. Appl. Phys. 103 07E134
[8] Yan A, Gutfleisch O, Handstein A, Gemming T, Muller K H 2003 J. Appl. Phys. 93 7975
[9] Gopalan R, Hono K, Yan A, Gutfleisch O 2009 Scri. Mater. 60 764
[10] Xiong X Y, Ohkubo T, Koyama T, Ohashi K, Tawara K, Hono K 2004 Acta Mater. 52 737
[11] Gutfleisch O, Müller K H, Khlopkov K, Wolf M, Yan A, Schäfer R, Gemming T, Schultz T 2006 Acta Mater. 54 997
[12] Craik D J, Hill E 1974 Phys. Lett. 48 157
[13] Liu J F, Hadjipanayis G C 1999 J. Magn. Magn. Mater. 195 620
[14] Liu J F, Zhang Y, Dimitrov D, Hadjipanayis G C 1999 J. Appl. Phys. 85 2800
[15] Liu S, Yang J, Doyle G, Potts G, Kuhl G 2000 J. Appl. Phys. 87 6728
[16] Kronmüller H, Goll D 2002 Scri. Mater. 47 545
Catalog
Metrics
- Abstract views: 7695
- PDF Downloads: 430
- Cited By: 0
下载:
