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首页> 外文会议>Symposium R on Electromagnetic Materials; 20050703-08; Singapore(SG) >Comparison of Magnetic Properties of Metallic Glasses Fe_(75)B_(10)Si_(15), Fe_(72)Co_3B_(10)Si_(15), Fe_(74)Co_(10)B_(16) and Fe_(67)Co_(18)B_(14)Si_1 by Mossbauer Spectroscopy
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Comparison of Magnetic Properties of Metallic Glasses Fe_(75)B_(10)Si_(15), Fe_(72)Co_3B_(10)Si_(15), Fe_(74)Co_(10)B_(16) and Fe_(67)Co_(18)B_(14)Si_1 by Mossbauer Spectroscopy

机译：金属玻璃Fe_（75）B_（10）Si_（15），Fe_（72）Co_3B_（10）Si_（15），Fe_（74）Co_（10）B_（16）和Fe_（67）的磁性比较Co_（18）B_（14）Si_1通过Mossbauer光谱学

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~(57)Fe Mossbauer spectroscopy has been used to study the temperature dependence of magnetic properties of a few iron-rich metallic glasses Fe_(75)B_(10)Si_(15) (S1), Fe_(72)Co_3B_(10)Si_(15) (S2), Fe_(74)Co_(10)B_(16) (S3) and Fe_(67)Co_(18)B_(14)Si_1 (S4) in the temperature range 77-900K. The Curie temperatures (T_c) of these samples S1, S2, S3 and S4 are found to be 682 K, 725 K, 760K and 830K respectively. The crystallization temperatures (T_x) of S1, S2, S3 and S4 are found to be 832K, 81 OK, 665K and 650K respectively. Thus, addition of Cobalt to Fe_(75)B_(10)Si_(15) metallic glass increases the Curie temperature and decreases the crystallization temperature. Samples S3 and S4 transform into crystalline phases before they become paramagnetic. Mossbauer spectra of 'as received' samples below Curie temperature for samples S1, S2 and below crystallization temperature of samples S3 and S4 consist of six broad absorption lines, typical of iron-rich metallic glasses. Thus, the observed six -line spectra are the indicative of the ferromagnetic amorphous state of each sample with random atomic arrangements and inequivalent Fe sites. The Mossbauer line widths of these metallic glasses are compared and discussed. Below T_c for samples S1 and S2 and below T_x of samples S3 and S4, Mossbauer spectra have been analyzed to yield the hyperfine field distribution curve P(H). P(H) curves are characterized by a single well defined peak centered around the value of magnetic field close to the measured hyperfine magnetic field H_(eff) (T). All the above amorphous samples show a more rapid decrease in reduced hyperfine magnetic fields, H_(eff)(T)/H_(eff)(0) versus reduced temperature T/T_c. The temperature dependence of H_(eff) (T) follows the theoretical expression given by Handrich's model of an amorphous ferromagnet in which the fluctuation exchange parameter 'δ' is assumed to follow the relation δ =δ_0 (1-t~2) where δ_0 = 0.6 and t = T/ T_c. The value of H_(eff) (RT) for S1, S2, S3 and S4 are found to be 254 kOe, 248 kOe, 277 kOe and 289 kOe, respectively. The values of effective magnetic hyperfine field (H_(eff)) , mean field(H), most probable field(H_p), Curie temperature(T_c) and full width at half maximum (FWHM) of the above metallic glasses are compared and discussed.
机译：〜（57）Fe Mossbauer光谱已用于研究一些富铁金属玻璃Fe_（75）B_（10）Si_（15）（S1），Fe_（72）Co_3B_（10）的磁性的温度依赖性Si_（15）（S2），Fe_（74）Co_（10）B_（16）（S3）和Fe_（67）Co_（18）B_（14）Si_1（S4）在77-900K的温度范围内。这些样品S1，S2，S3和S4的居里温度（T_c）分别为682 K，725 K，760K和830K。发现S1，S2，S3和S4的结晶温度（T_x）分别为832K，81OK，665K和650K。因此，向Fe_（75）B_（10）Si_（15）金属玻璃中添加钴会增加居里温度，并降低结晶温度。样品S3和S4在变成顺磁性之前就转变为结晶相。样品S1，S2的居里温度以下和样品S3和S4的结晶温度以下的“接收”样品的Mossbauer光谱由六条宽吸收线组成，这是富铁金属玻璃的典型特征。因此，观察到的六线光谱表示具有随机原子排列和不等价的Fe位点的每个样品的铁磁非晶态。比较并讨论了这些金属玻璃的Mossbauer线宽。在样品S1和S2的T_c以下，在样品S3和S4的T_x以下，对Mossbauer光谱进行了分析，得出了超精细场分布曲线P（H）。 P（H）曲线的特征是一个明确定义的峰，该峰的中心是靠近所测超精细磁场H_（eff）（T）的磁场值。所有上述非晶样品在降低的超精细磁场H_（eff）（T）/ H_（eff）（0）相对于降低的温度T / T_c方面显示出更快的降低。 H_（eff）（T）的温度依赖性遵循非晶铁磁体的Handrich模型给出的理论表达式，其中假设波动交换参数'δ'遵循关系δ=δ_0（1-t〜2），其中δ_0 = 0.6且t = T / T_c。 S1，S2，S3和S4的H_（eff）（RT）值分别为254 kOe，248 kOe，277 kOe和289 kOe。比较并讨论了上述金属玻璃的有效磁超精细场（H_（eff）），平均场（H），最可能场（H_p），居里温度（T_c）和半峰全宽（FWHM）的值。

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