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이방성 Sr - 페라이트 / 레진본드 영구자석에서 Sr - 페라이트 자성분말의 방향성
정원용(W. Y. Jeung),조태식(T. S. Cho),문탁진(T. J. Moon) 한국자기학회 1994 韓國磁氣學會誌 Vol.4 No.3
The alignment of Sr-ferrite magnetic powders, which is usually related to the fluidity and the applied magnetic field, is investicated in the anisotropic Sr-ferrite /resin-bonded permanent magnets. The magnetic powder alignment is observed to increase with the applied magnetic field and the fluidity which is a function of molding temperature and powder packing ratio. The rest magnetic powder alignment is achieved at the following conditions; Sr-ferrite packing ratio of 56vol%, apparent viscosity of about 3000 poise in 1000sec-¹ shear rate, and applied magnetic field of about 5kOe. The degree of preferred orientation of the magnetic powders in the field direction, as determined by the dc hysterisis graphs, is 84~85%(0.84~0.85). This result is in agreement with the value of 0.85 obtained by the X-ray experiments in the 2θ range of 23~40^0. The best magnetic properties obtained are; 2.2kG of remanent flux density, 2.2MGOe of maximum energy product.
전기도금 시 외부자기장이 CoPtP 합금의 자기 특성에 미치는 영향
정원용(W. Y. Jeung),박호동(H. D. Park) 한국자기학회 2005 韓國磁氣學會誌 Vol.15 No.5
We have investigated the effects of an external magnetic field on the growth direction and the grain size of electrochemically prepared CoPtP alloys. Electrodeposited CoPtP alloys were synthesized by appling an external magnetic field with 0 to 1 T to the perpendicular direction of the films. In the electrodeposited CoPtP alloys without external magnetic field, the growth direction of the alloys was mixed by fcc (111) and hcp (002), but only hcp (002) was observed in the alloys with 1 T external magnetic field. CoPtP alloys were grown as the columnar growth and the grain size increases with growing the alloys. With appling an external field, the grain size of the alloys was controlled less than 20 ㎚ which is smaller than single domain of Co, and the easy axis of alloys, hcp (002) direction, was grown perpendicular to the films up to 200 ㎚. We could obtain the optimal thickness of the alloys and electrodeposition condition from the above results. Coercivity and squareness of CoPtP alloys taken out-of-plane are 6.1 kOe and 0.9, respectively. The magnetic properties of CoPtP alloys were measured by VSM, and the microstructural characterization and crystalline orientation measurement of the alloys were carried out by TEM and XRD.