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脈沖磁場(chǎng)致非晶合金納米晶化及巨磁阻抗研究
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Study of Amorphous Alloy Nano-crystallization and Giant Magnetic Impedance by Pulsing Magnetic Field
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    摘要:

    對(duì)Co68.15Fe4.35Si12.5B15非晶合金薄帶進(jìn)行低頻脈沖磁場(chǎng)處理，M?ssbauer譜分析及透射電鏡(TEM)觀察結(jié)果表明，樣品發(fā)生了初始納米晶化，晶化量與磁脈沖強(qiáng)度有關(guān)。采用巨磁阻抗(簡(jiǎn)稱GMI)測(cè)量?jī)x測(cè)量樣品GMI，結(jié)果顯示GMI與脈沖磁場(chǎng)強(qiáng)度HP呈非單調(diào)變化規(guī)律，HP為350 kA·m-1時(shí)樣品具有最大GMI，其值為263.5%。磁脈沖在樣品內(nèi)感生的橫向各向異性對(duì)GMI效應(yīng)產(chǎn)生影響，當(dāng)外加直流磁場(chǎng)Hex等于感生磁各向異性場(chǎng)Hk時(shí)，GMI出現(xiàn)峰值

    Abstract:

    Amorphous Co68.15Fe4.35Si12.5B15 alloy ribbons were treated by low-frequency pulsing magnetic field. M?ssbauer spectroscopy and TEM observation show that initial nano-crystallization of the amorphous samples occurs, and the volume fraction of crystallized phase has a relation with pulsing magnetic field intensity. The giant magnetic impedance (GMI ) of the samples were tested by a GMI instrument; the results show a non-monotonic change between GMI and pulsing magnetic field intensity HP, and the GMI reaches the greatest value of 263.5% under the magnetic field intensity HP=350 kA·m-1. The transverse anisotropy induced by pulsing magnetic field in specimens affects the GMI effect. When the external dc current magnetic filed Hex is equal to Hk, GMI reaches the peak value

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郭 紅,晁月盛,金 瑩.脈沖磁場(chǎng)致非晶合金納米晶化及巨磁阻抗研究[J].稀有金屬材料與工程,2011,40(7):1163~1167.[Guo Hong, Chao Yuesheng, Jin Ying. Study of Amorphous Alloy Nano-crystallization and Giant Magnetic Impedance by Pulsing Magnetic Field[J]. Rare Metal Materials and Engineering,2011,40(7):1163~1167.]
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  • 收稿日期:2010-07-21
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