论文标题
LA0.7CA0.3-XSRXMNO3的铁磁和顺磁样品中的宽带磁磁性
Broadband Magnetoresistance in Ferromagnetic and Paramagnetic Samples of La0.7Ca0.3-xSrxMnO3
论文作者
论文摘要
我们研究了LA0.7CA0.7CA0.3-XSRXMNO3系列的磁磁性（X = 0.06）和铁磁（X = 0.1）样品的室温磁性磁性，并使用网络分析仪也使用了微波吸收功率。在这两种测量值中，将样品紧密地封闭在铜制涂件内，并在此铜制条件上测量该铜条件的阻抗或反射系数，作为施加磁场的函数，对于不同的电流频率（F = 0.1至2.5 GHz）。施加的磁场的方向垂直于线圈产生的交替磁场。在铁磁样品（x = 0.1）中，磁磁性显示较低频率周围零场的峰值，但在较高频率下，远离原点的峰出现。峰的位置随着频率的增加而向更高的场所转移。对于顺磁样品（x = 0.06），也发现了类似的趋势，但是与相同频率相比，与铁磁样品相比，峰出现在较高的场上。微波功率的吸收还显示出类似于磁路线的特征。通过将数据拟合到Lorentzian函数来执行数据的线形分析。结论是，观察到的特征是X = 0.1中铁磁共振的烙印，而X = 0.06样品中的顺磁共振。
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.
