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According to the shock wave experiment on the Nd2Fe14B ferromagnet, the relationship between pressure and temperature on the shock front is calculated in a pressure range from 3.3 GPa to 7.2 GPa. In order to analyze the magnetic transition mechanism of Nd2Fe14B under different temperatures and applied pressures, the equivalent pressure field is introduced to improve the two-sublattice model based on the molecular field theory. The pressure dependence of magnetostriction coefficient, susceptibility, magnetization, and Curie temperature of Nd2Fe14B are calculated. The criteria of the ferromagnetic-paramagnetic phase transition occurring in Nd2Fe14B at different temperatures and pressures are obtained. The results indicate that the Curie temperature of Nd2Fe14B decreases as pressure increases. The Curie temperature reduces from 584 K at 0 GPa to 298 K at 1.142 GPa. With the increasing of pressure, the magnetization of Nd2Fe14B declines. The critical demagnetization pressure of Nd2Fe14B also decreases with the increasing of temperature. In a pressure region from 3.3 GPa to 7.2 GPa, there appears the pressure induced ferromagnetic-paramagnetic phase transition of Nd2Fe14B.
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Keywords:
- ferromagnetic-paramagnetic phase transition /
- Curie temperature /
- molecular field theory /
- Nd2Fe14B
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[2] Zhang Z W, Zhang X M, Ren S W, Han L P, Ni Z C, Liu Z Y 2002 J. Magn. Magn. Mater. 248 158
[3] Zhang X M, Huang R W, Zhang Z W 2002 J. Magn. Magn. Mater. 241 131
[4] Zhang Z W, Huang R W 1992 J. Alloys Compd. 185 363
[5] Ren S W, Zhang Z W, Liu Y 1995 J. Magn. Magn. Mater. 139 175
[6] Hao Y M 2000 Chin. Phys. Lett. 17 444
[7] Wang X G, Pan S H, Yang G Z 2000 Chin. Phys. Lett. 17 132
[8] Guo G H 2001 Acta Phys. Sin. 50 313 (in Chinese) [郭光华 2001 50 313]
[9] Prasongkit J, Tang I M 2004 J. Magn. Magn. Mater. 284 376
[10] Wang W, Xu H J, Xu X M, Zhang Y J, Li F 2013 J. Magn. Magn. Mater. 331 225
[11] Hu T Li, Wang X, Han B, Li Y, Huang F X, Zhou Q, Zhang T 2013 Chin. Phys. B 22 120701
[12] Zhang B P, Zhang Q M, Huang F L 2001 Theory of Detonation Physics (Beijing: Weapon Industry Press) p402 (in Chinese) [张宝平, 张庆明, 黄风雷 2001 爆轰物理学 (北京: 兵器工业出版社) 第402页]
[13] Kaminski D A, Jiles D C, Biner S B, Sablik M J 1992 J. Magn. Magn. Mater. 104 382
[14] Bozorth R M 1951 Ferromagnetism (New York: D. Van Nostrand) p610
[15] Wang H J 2007 Ph. D. Dissertation (Beijing: Central Iron and Steel Research Institute) (in Chinese) [王会杰 2007 博士学位论文 (北京: 钢铁研究总院)]
[16] Hirosawa S, Matsuura Y, Yamamoto H, Fujimura S, Sagawa M 1986 J. Appl. Phys. 59 873
[17] Zhou S Z, Dong Q F 2004 Supermagnets: Rare-earth and Iron System Permanent Magnet (Beijing: Metallurgical Industry Press) p7 (in Chinese) [周寿增, 董清飞 2004 超强永磁体–稀土铁系永磁材料(北京: 冶金工业出版社)第7页]
[18] Li Y F, Zhu M G, Li W Zhou D, Lu F Chen L, Wu J Y, Qi Y, Du A 2013 Chin. Phys. Lett. 30 097501
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[1] Herbst J F, Croat J J 1982 J. Appl. Phys. 53 4304
[2] Zhang Z W, Zhang X M, Ren S W, Han L P, Ni Z C, Liu Z Y 2002 J. Magn. Magn. Mater. 248 158
[3] Zhang X M, Huang R W, Zhang Z W 2002 J. Magn. Magn. Mater. 241 131
[4] Zhang Z W, Huang R W 1992 J. Alloys Compd. 185 363
[5] Ren S W, Zhang Z W, Liu Y 1995 J. Magn. Magn. Mater. 139 175
[6] Hao Y M 2000 Chin. Phys. Lett. 17 444
[7] Wang X G, Pan S H, Yang G Z 2000 Chin. Phys. Lett. 17 132
[8] Guo G H 2001 Acta Phys. Sin. 50 313 (in Chinese) [郭光华 2001 50 313]
[9] Prasongkit J, Tang I M 2004 J. Magn. Magn. Mater. 284 376
[10] Wang W, Xu H J, Xu X M, Zhang Y J, Li F 2013 J. Magn. Magn. Mater. 331 225
[11] Hu T Li, Wang X, Han B, Li Y, Huang F X, Zhou Q, Zhang T 2013 Chin. Phys. B 22 120701
[12] Zhang B P, Zhang Q M, Huang F L 2001 Theory of Detonation Physics (Beijing: Weapon Industry Press) p402 (in Chinese) [张宝平, 张庆明, 黄风雷 2001 爆轰物理学 (北京: 兵器工业出版社) 第402页]
[13] Kaminski D A, Jiles D C, Biner S B, Sablik M J 1992 J. Magn. Magn. Mater. 104 382
[14] Bozorth R M 1951 Ferromagnetism (New York: D. Van Nostrand) p610
[15] Wang H J 2007 Ph. D. Dissertation (Beijing: Central Iron and Steel Research Institute) (in Chinese) [王会杰 2007 博士学位论文 (北京: 钢铁研究总院)]
[16] Hirosawa S, Matsuura Y, Yamamoto H, Fujimura S, Sagawa M 1986 J. Appl. Phys. 59 873
[17] Zhou S Z, Dong Q F 2004 Supermagnets: Rare-earth and Iron System Permanent Magnet (Beijing: Metallurgical Industry Press) p7 (in Chinese) [周寿增, 董清飞 2004 超强永磁体–稀土铁系永磁材料(北京: 冶金工业出版社)第7页]
[18] Li Y F, Zhu M G, Li W Zhou D, Lu F Chen L, Wu J Y, Qi Y, Du A 2013 Chin. Phys. Lett. 30 097501
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