铁磁和顺磁La0 0.3- xSrxMnO3样品的宽带磁电阻
Broadband Magnetoresistance in Ferromagnetic and Paramagnetic Samples of La0.7Ca0.3-xSrxMnO3
摘要：
我们研究了室温磁电阻抗的顺磁性（x = 0.06）和铁磁性（x = 0.1）样品在La 0.7Ca 0.3-xSrxMnO 3系列使用射频阻抗分析仪和微波功率吸收使用网络分析仪。在两种测量中，将样品紧密地封闭在铜带线圈内，并且测量该铜带线圈的阻抗或反射系数作为对于不同频率的电流（f = 0.1至2.5 GHz）施加的磁场的函数。施加的磁场的方向垂直于线圈产生的交变磁场。在铁磁样品（x = 0.1）中，磁阻在较低频率下在零场附近显示出峰值，但在较高频率下在远离原点的H处出现峰值。随着频率的增加，峰值的位置向更高的场移动。对于顺磁性样品（x = 0.06）也发现了类似的趋势，但对于相同的频率，与铁磁性样品相比，峰值出现在更高的场。微波功率吸收也表现出类似于磁电阻的特性。通过将数据拟合到洛伦兹函数来进行数据的线形分析。得出的结论是，所观察到的功能是印记的铁磁共振在x = 0.1和顺磁共振在x = 0.06的样品。
英文摘要：
We have studied the room-temperature magnetoimpedance of paramagnetic (x = 0.06) and ferromagnetic (x = 0.1) samples in La0.7Ca0.3-xSrxMnO3 series using a radio-frequency impedance analyzer and also microwave power absorption using a network analyzer. In both measurements, samples were enclosed tightly inside a copper stripcoil and impedance or reflection coefficient of this copper stripcoil was measured as a function of the applied magnetic field for different frequencies of current (f = 0.1 to 2.5 GHz). The direction of the applied magnetic field was perpendicular to the alternating magnetic field produced by the coil. In the ferromagnetic sample (x = 0.1), magnetoresistance shows a peak around zero field for lower frequencies but a peak appears at H away from the origin at higher frequencies. The position of the peak shifts towards higher fields with increasing frequency. A similar trend is also found for the paramagnetic sample (x = 0.06) but the peak occurs at a higher field compared to the ferromagnetic sample for the same frequency. Microwave power absorption also shows features similar to magnetoresistance. Line shape analysis of the data was performed by fitting the data to a Lorentzian function. It is concluded that the observed features are imprints of ferromagnetic resonance in x = 0.1 and paramagnetic resonance in x = 0.06 samples.
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