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The structural and the magnetic properties of Co50Fe50-xSix alloys are investigated by carrying out experimental measurements and electron structure calculation. The alloy series exhibits the highly chemical ordering structure, showing a strong covalent bonding effect. The lattice parameters, molecular moment and Curie temperature linearly decrease with the increase of the Si content. The deviation of the structure is attributed to the atomic size effect. Based on Stearns theories, the decrease of the itinerant 3d (di) electron results in the decrease of Curie temperature due to the substitution of Si for Fe. The change of molecular moment follows the Slater-Pauling rule, but the calculation indicates that the change of the atomic moments is not linear. It implies that the covalent bonding effect is responsible for the magnetic changes. The molecular moment and Curie temperature of Heusler alloy Co2FeSi are measured to be 5.92 B and 777 ℃, respectively. The calculation results also indicate that the half-metallic property of Co2FeSi may not be so perfect as reported, which requires a new design of energy band for the practical application. The investigation also shows that the structural transition and the magnetic structure transition accumulate in a narrow interval of Si content, which may become a good object for studying the interaction between the magnetization and the structure.
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Keywords:
- magnetic properties /
- Heusler alloys /
- structural phase transition
[1] Wurmehl S, Fecher G H, Kandpal H C, Ksenofontov V, Felser C, Lin H J 2006 Appl. Phys. Lett. 88 032503
[2] [3] Nakatani T M, Rajanikanth A, Gercsi Z, Takahashi Y K, Inomata K, Hono K 2007 J. Appl. Phys. 102 033916
[4] [5] Eguchi T, Matsuda H, Oki K 1968 IEEE Trans. Magn. 4 476
[6] [7] Hanlumyuang Y, Ohodnicki P R, Laughlin D E, McHenry M E 2006 J. Appl. Phys. 99 08F101
[8] [9] Okamoto H, Subramanian P R, Kacprzak L 2000 Desk Handbook Phase Diagrams for Binary Alloys (Vol. 2) (Ohio: ASM International) p1186
[10] [11] Dai D S, Qian K M 1987 Ferromagnetism (Vol. 1) (Beijing: Science Press) p105 (in Chinese) [戴道生、钱昆明 1987 铁磁学(上卷)(北京:科学出版社) 第105页]
[12] [13] Webster P J 1969 Contemp. Phys. 10 559
[14] Huang K, Han R Q 1988 Solid State Physics (Beijing: Higher Education Press) p417 (in Chinese) [黄 昆、韩汝琦 1988 固体物理 (北京:高等教育出版社) 第417页]
[15] [16] Stearns M B 1973 Phys. Rev. B 8 4383
[17] [18] [19] Stearns M B, Norbeck J M 1979 Phys. Rev. B 20 3739
[20] Buschow K H J, van Engen P G, Jongebreur R 1983 J. Magn. Magn.Mater. 38 1
[21] [22] Wurmehl S, Fecher G H, Kandpal H C, Ksenofontov V, Felser C, Lin H J, Morais J 2005 Phys. Rev. B 72 184434
[23] [24] O'handley R C 1999 Modern Magnetic Materials:Principles and Applications (Vol. 2) (New York: A Wiley-Interscience Publication) p144
[25] [26] Kbler J, William A R, Sommers C B 1983 Phys. Rev. B 28 1745
[27] [28] Qi J S, Yu H L, Jiang X F, Shi D N 2010 Int. J. Mod. Phys. B 24 967
[29] [30] [31] Zhao J J, Qi X, Liu E K, Zhu W, Li G J, Wang W H, Wu G H 2011 Acta Phys. Sin. 60 047108 (in Chinese) [赵晶晶、祁 欣、刘恩克、朱 伟、钱金凤、李贵江、王文洪、吴光恒 2011 60 047108]
[32] Balke B, Fecher G H, Felser C 2007 Appl. Phys. Lett. 90 242503
[33] -
[1] Wurmehl S, Fecher G H, Kandpal H C, Ksenofontov V, Felser C, Lin H J 2006 Appl. Phys. Lett. 88 032503
[2] [3] Nakatani T M, Rajanikanth A, Gercsi Z, Takahashi Y K, Inomata K, Hono K 2007 J. Appl. Phys. 102 033916
[4] [5] Eguchi T, Matsuda H, Oki K 1968 IEEE Trans. Magn. 4 476
[6] [7] Hanlumyuang Y, Ohodnicki P R, Laughlin D E, McHenry M E 2006 J. Appl. Phys. 99 08F101
[8] [9] Okamoto H, Subramanian P R, Kacprzak L 2000 Desk Handbook Phase Diagrams for Binary Alloys (Vol. 2) (Ohio: ASM International) p1186
[10] [11] Dai D S, Qian K M 1987 Ferromagnetism (Vol. 1) (Beijing: Science Press) p105 (in Chinese) [戴道生、钱昆明 1987 铁磁学(上卷)(北京:科学出版社) 第105页]
[12] [13] Webster P J 1969 Contemp. Phys. 10 559
[14] Huang K, Han R Q 1988 Solid State Physics (Beijing: Higher Education Press) p417 (in Chinese) [黄 昆、韩汝琦 1988 固体物理 (北京:高等教育出版社) 第417页]
[15] [16] Stearns M B 1973 Phys. Rev. B 8 4383
[17] [18] [19] Stearns M B, Norbeck J M 1979 Phys. Rev. B 20 3739
[20] Buschow K H J, van Engen P G, Jongebreur R 1983 J. Magn. Magn.Mater. 38 1
[21] [22] Wurmehl S, Fecher G H, Kandpal H C, Ksenofontov V, Felser C, Lin H J, Morais J 2005 Phys. Rev. B 72 184434
[23] [24] O'handley R C 1999 Modern Magnetic Materials:Principles and Applications (Vol. 2) (New York: A Wiley-Interscience Publication) p144
[25] [26] Kbler J, William A R, Sommers C B 1983 Phys. Rev. B 28 1745
[27] [28] Qi J S, Yu H L, Jiang X F, Shi D N 2010 Int. J. Mod. Phys. B 24 967
[29] [30] [31] Zhao J J, Qi X, Liu E K, Zhu W, Li G J, Wang W H, Wu G H 2011 Acta Phys. Sin. 60 047108 (in Chinese) [赵晶晶、祁 欣、刘恩克、朱 伟、钱金凤、李贵江、王文洪、吴光恒 2011 60 047108]
[32] Balke B, Fecher G H, Felser C 2007 Appl. Phys. Lett. 90 242503
[33]
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