本文選題：縱向驅(qū)動(dòng)的巨磁阻抗效應(yīng)　切入點(diǎn)：驅(qū)動(dòng)場(chǎng)　出處：《華東師范大學(xué)》2017年碩士論文

【摘要】：近年來,軟磁材料GMI(Giant Magnetoimpedance effect)效應(yīng)因其靈敏度高、體積小、功耗低等優(yōu)點(diǎn)成為研發(fā)弱磁傳感器的主要方法之一,引起國(guó)內(nèi)外廣泛關(guān)注。目前驅(qū)動(dòng)場(chǎng)對(duì)GMI效應(yīng)影響的研究主要采用傳統(tǒng)的四探針法測(cè)量模式。但存在磁材料焊接和材料受焦耳熱影響的問題,使驅(qū)動(dòng)場(chǎng)大小受到限制。本文采用縱向驅(qū)動(dòng)方式來研究Fe_(73.5)Cu_1Nb_3Si_(13.5)B_9納米晶條帶的GMI效應(yīng)。同時(shí),分析了不同片數(shù)納米晶條帶的磁滯回線變化特點(diǎn),以及驅(qū)動(dòng)場(chǎng)和納米晶條帶片數(shù)對(duì)樣品的LDGMI效應(yīng)、感應(yīng)電壓波形和諧波分布的影響,主要結(jié)論如下:(1)發(fā)現(xiàn)隨著Fe_(73.5)Cu_1Nb_3Si_(13.5)B_9納米晶條帶片數(shù)的增加,因相鄰條帶間存在磁偶極相互作用。樣品的各向異性場(chǎng)和飽和磁化強(qiáng)度均線性地增加,矯頑力近乎為零,磁結(jié)構(gòu)更加偏橫向。(2)低驅(qū)動(dòng)場(chǎng)下不同片數(shù)納米晶條帶的LDGMI曲線形狀均為"小平臺(tái)",且"平臺(tái)"寬度受驅(qū)動(dòng)場(chǎng)大小、頻率的調(diào)制。同時(shí),因條帶間存在磁偶極相互作用,樣品的"平臺(tái)"寬度和各向異性場(chǎng)均隨條帶片數(shù)的增多而線性增加;(3)不同的樣品在高驅(qū)動(dòng)場(chǎng)下均會(huì)發(fā)生非線性磁化,其LDGMI曲線均表現(xiàn)為"大平臺(tái)"。當(dāng)交變驅(qū)動(dòng)場(chǎng)的增強(qiáng)時(shí),各向異性場(chǎng)小的樣品非線性磁化的程度高,相同條件下樣品的LDGMI曲線"平臺(tái)"展寬。同時(shí),不同樣品在相同驅(qū)動(dòng)場(chǎng)下的頻譜曲線形狀不同,各向異性場(chǎng)小的樣品特征頻率易向高頻移動(dòng),究其原因是樣品在相同條件下非線性磁化程度不同造成的。
[Abstract]:In recent years, the soft magnetic material GMI(Giant Magnetoimpedance effecteffect has become one of the main methods for developing weak magnetic sensors because of its high sensitivity, small size and low power consumption. At present, the influence of driving field on GMI effect is mainly studied by traditional four-probe method. However, there are some problems in magnetic material welding and Joule heat effect. The size of driving field is limited. The GMI effect of Fe_(73.5)Cu_1Nb_3Si_(13.5)B_9 nanocrystalline strip is studied by longitudinal driving method. At the same time, the characteristics of hysteresis loop of nanocrystalline strip with different number of chips are analyzed. The effects of driving field and the number of nanocrystalline strips on the LDGMI effect, induced voltage waveform and harmonic distribution of the samples are also discussed. The main conclusions are as follows: 1) it is found that with the increase of the number of Fe_(73.5)Cu_1Nb_3Si_(13.5)B_9 nanocrystalline strips, Due to the magnetic dipole interaction between adjacent bands, the anisotropic field and saturation magnetization of the sample increase linearly, and the coercivity is near zero. The shape of LDGMI curve of nanocrystalline strips with different number of slices is "small platform", and the width of "platform" is modulated by the driving field size and frequency. At the same time, because of the magnetic dipole interaction between the strips, Both the "platform" width and the anisotropic field of the sample increase linearly with the increase of the number of strips. The samples with different samples have nonlinear magnetization under high driving field, and their LDGMI curves are all shown as "large platforms". When the alternating driving field increases, The nonlinear magnetization of the sample with small anisotropic field is high, and the LDGMI curve "platform" of the sample is widened under the same conditions. At the same time, the shape of the spectrum curve is different for different samples under the same driving field. The characteristic frequency of the sample with small anisotropic field is easy to move to high frequency, which is caused by the different nonlinear magnetization degree of the sample under the same condition.
【學(xué)位授予單位】：華東師范大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TB383.1

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