I.INTRODUCTION Hematite （α-Fe2O3） has an antiferromagnetic structure and crystallizes into the rhombohedral structure with space group D3d6. If the c-axis is chosen to describe this trigonal system, the anisotropy ...I.INTRODUCTION Hematite （α-Fe2O3） has an antiferromagnetic structure and crystallizes into the rhombohedral structure with space group D3d6. If the c-axis is chosen to describe this trigonal system, the anisotropy energy can be expressed approximately as fol-lows:展开更多
I. INTRODUCTIONThe outstanding magnetic properties of Nd-Fe-B permanent alloy with very high coercive force and maximum magnetic energy product have attracted scientists’ attention greatly and extensive investigation...I. INTRODUCTIONThe outstanding magnetic properties of Nd-Fe-B permanent alloy with very high coercive force and maximum magnetic energy product have attracted scientists’ attention greatly and extensive investigation has been made on its structure and mag-展开更多
Ⅰ. INTRODUCTIONCo-coated γ-Fe<sub>2</sub>O<sub>3</sub> magnetic powder is a new magnetic recording material developed in recent years. It is divided into two sorts: Co-doped γ-Fe<sub>2...Ⅰ. INTRODUCTIONCo-coated γ-Fe<sub>2</sub>O<sub>3</sub> magnetic powder is a new magnetic recording material developed in recent years. It is divided into two sorts: Co-doped γ-Fe<sub>2</sub>O<sub>3</sub> （known as Co-γ-Fe<sub>2</sub>O<sub>3</sub>） and Co-ferrite epitaxial γ-Fe<sub>2</sub>O<sub>3</sub> （known as CoFe-γ-Fe<sub>2</sub>O<sub>3</sub>）. The coercivity of Co-coated γ-Fe<sub>2</sub>O<sub>3</sub>展开更多
Ⅰ. INTRODUCTION The amorphous magnetic alloys have high resistivity, high permeability, low coercive force, low losses and excellent corrosion and wear resistances. Especially, Co-based amorphous alloy films having b...Ⅰ. INTRODUCTION The amorphous magnetic alloys have high resistivity, high permeability, low coercive force, low losses and excellent corrosion and wear resistances. Especially, Co-based amorphous alloy films having better permeability-frequency character than permalloy in high frequency range are known as ideal material for fabricating magnetic recording head. However,展开更多
I. INTRODUCTION The Co based amorphous soft magnetic films have been found to have high saturation magnetization, low coercivities, zero magnetostriction constants and high permeabilities. Amorphous magnetic films als...I. INTRODUCTION The Co based amorphous soft magnetic films have been found to have high saturation magnetization, low coercivities, zero magnetostriction constants and high permeabilities. Amorphous magnetic films also have good corrosion resistance, high resistivity and good high frequency properties. These make the amorphous films preferable to crystal Permalloy films when used as magnetic recording heads, current inductors, thin film transformers, surface acoustic wave variable delay lines, and many other thin film devices. It has become a very attractive material.展开更多
A calculation of the magnetic single-ion anisotropy in hematite has been made.The results show that an equivalent single-ion anisotropy field Hsi(=103.8×10^(2) Oe)exists along the c-axis at T=0K.The Morin transit...A calculation of the magnetic single-ion anisotropy in hematite has been made.The results show that an equivalent single-ion anisotropy field Hsi(=103.8×10^(2) Oe)exists along the c-axis at T=0K.The Morin transition in hematite could be explained by our results in conjunction with the calculated H_(md) by Artman et al.展开更多
文摘I.INTRODUCTION Hematite （α-Fe2O3） has an antiferromagnetic structure and crystallizes into the rhombohedral structure with space group D3d6. If the c-axis is chosen to describe this trigonal system, the anisotropy energy can be expressed approximately as fol-lows:
文摘I. INTRODUCTIONThe outstanding magnetic properties of Nd-Fe-B permanent alloy with very high coercive force and maximum magnetic energy product have attracted scientists’ attention greatly and extensive investigation has been made on its structure and mag-
文摘Ⅰ. INTRODUCTIONCo-coated γ-Fe<sub>2</sub>O<sub>3</sub> magnetic powder is a new magnetic recording material developed in recent years. It is divided into two sorts: Co-doped γ-Fe<sub>2</sub>O<sub>3</sub> （known as Co-γ-Fe<sub>2</sub>O<sub>3</sub>） and Co-ferrite epitaxial γ-Fe<sub>2</sub>O<sub>3</sub> （known as CoFe-γ-Fe<sub>2</sub>O<sub>3</sub>）. The coercivity of Co-coated γ-Fe<sub>2</sub>O<sub>3</sub>
文摘Ⅰ. INTRODUCTION The amorphous magnetic alloys have high resistivity, high permeability, low coercive force, low losses and excellent corrosion and wear resistances. Especially, Co-based amorphous alloy films having better permeability-frequency character than permalloy in high frequency range are known as ideal material for fabricating magnetic recording head. However,
基金One of the projects supported by the Science Fund of the Chinese Academy of Sciences
文摘I. INTRODUCTION The Co based amorphous soft magnetic films have been found to have high saturation magnetization, low coercivities, zero magnetostriction constants and high permeabilities. Amorphous magnetic films also have good corrosion resistance, high resistivity and good high frequency properties. These make the amorphous films preferable to crystal Permalloy films when used as magnetic recording heads, current inductors, thin film transformers, surface acoustic wave variable delay lines, and many other thin film devices. It has become a very attractive material.
文摘A calculation of the magnetic single-ion anisotropy in hematite has been made.The results show that an equivalent single-ion anisotropy field Hsi(=103.8×10^(2) Oe)exists along the c-axis at T=0K.The Morin transition in hematite could be explained by our results in conjunction with the calculated H_(md) by Artman et al.
