YIG ( Y 3   Fe 5   O_{12})의미세구조및자성특성에대한 SrTiO_3$ 첨가 영향

장학진; 윤석영; 김태옥; Hak-Jin Jang; Seog-Young Yoon; Tae-Ok Kim

Korean Journal of Materials Research, Vol.11, No.3, 203-206, March, 2001

Export Citation

YIG ( Y 3 Fe 5 O_{12})의미세구조및자성특성에대한 SrTiO_3$ 첨가 영향

The Effects of SrTiO 3 Addition on the Microstructure and Magnetic Properties of YIG

장학진, 윤석영 , 김태옥

부산대학교 공과대학 무기재료공학과

Hak-Jin Jang, Seog-Young Yoon , and Tae-Ok Kim

Dept. of Inorganic Materials Engineering, Pusan National University, 30, Changjeon-Dong, Keumjeong-gu, Pusan 609-735, Korea

초록

SrTiO 3 첨가량 및 소결온도에 따른 YIG 소결체의 미세구조 및 자기적 특성변화에 대하여 조사하였다. 소량의 SrTiO 3 소결재를 첨가한 결과 소결체의 격자상수는 약간 증가하였으며, 이는 소결시 Y +3 , Fe +3 이온이 이온반경이 상대적으로 큰 Sr +2 , Ti +4 이온으로 치환되었기 때문인 것으로 추정된다. SrTiO 3 소결재를 0.2mo1% 첨가하고, 142 0 ? C 에서 소결한 소결체의 밀도는 이론밀도의 98%이상의 치밀화를 얻을 수 있었다. 상온에서의 포화자화값(M s )은 SrTiO 3 소결재의 첨가량이 증가함에 따라 약간 감소하였으나 큰 변화는 없었다. 더욱이 온도에 따른 보자력 (H c )의 변화는 없었다.

The effects of SrTiO 3 addition and sintering temperature on the microstructure and magnetic properties of yttrium iron garnet (YIG) were investigated. The lattice Parameter increasing of sintered YlG with small amount of SrTiO 3 addition was supposed to be substituted Y +3 , Fe +3 ions to Sr +2 ,Ti +4 ions which are relatively large in ionic ranius. A YIG specimen sintered at 142 0 ? C with 0.2mol% SrTiO 3 showed above 98% densification of theoretical density. Saturation magnetization (M s ) at room temperature decreased a little bit with increasing SrTiO 3 , addition but no great chance. In addition, the coercivity (H c ) was almost not changed by sintering temperature.

Keywords:yttium iron garnet(YIG);saturation magnetization (M s);coercivity (H c)

[References]

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Nicolas J, 'Microwave Ferrites', chapter 4 of Ferromagnetic Materials, vol. 2, edited by Wohlfarth EP, (North-Holland Publishers, New York) 257-280 (1986) (1986)
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[Related Articles]

[1] Knerr RH, IEEE Trans. Microwave Theory Tech., Mtt-23, 818 (1975)

[2] Urus DD, Bursuc ID, IEEE Trans. Magn., MAG-21, 1201 (1985)

[3] White RL, J. Appl. Phys., 40, 1061 (1969)

[4] Nicolas J, 'Microwave Ferrites', chapter 4 of Ferromagnetic Materials, vol. 2, edited by Wohlfarth EP, (North-Holland Publishers, New York) 257-280 (1986) (1986)

[5] Gomi M, Okazaki T, Abe M, IEEE Trans. Magn., MAG-23, 2967 (1987)

[6] Matsumoto K, Yamaguchi K, Ueno A, Fujii T, J. Magn. Soc. Jpn., 14, 247 (1990)

[7] Hansen P, Krumme JP, Thin Solid Film, 114, 69 (1984)

[8] Gomi M, Tanida T, Abe M, J. Appl. Phys., 57, 3888 (1985)

[9] Menzer G : Die Kristallstruktur der Granate, Centralbl. Min [A] 344, (1925) (1925)

[10] Gilleo MA, Geller S, Phys. Rev., 110, 73 (1958)

[11] Holmquiat WR, Kooi CF, Moss RW, J. Am. Ceram. Soc., Reaction kinetics of polycrystalline yttium iron garnet, 44, 194 (1961)

[12] Song YY, et al., J. Magn. Magn. Mater, The effect of Bi 2 O 3 additon on the microstructure and magnetic properties of YIG, 177-181, 257 (1998)

[13] Yang RJ, Wu TB, Lin IN, J. Mater. Sci., Densification and microstructure developement in the reaction sintering process of yttium iron garnet, 25, 3566 (1990)

[14] Dr. Gerhard Winkler, 'Vieweg Tracts in pure and applied physics', volume 5. magnetic garnet. Friedr Vieweg & Sohn Braunschweig/Wiesbaden, 34, 48 (1981) (1981)

[15] Cullity, 자성재료학, 반도출판사, 508 (1996)