论文标题
晶状体间隧道的出现以helimagnetic Manganes磷化物纳米棒薄膜中的负极磁势为主导
Emergence of Intergranular Tunneling Dominated Negative Magnetoresistance in Helimagnetic Manganese Phosphide Nanorod Thin Films
论文作者
论文摘要
螺旋磁体正在作为一种新型的用于旋转和传感器应用的新型材料。但是，对以薄膜形式进行的电荷和自旋传输特性进行研究的探索较少。在此，我们报告了在宽温度范围内（2-350 K）的高度结晶MNP纳米棒薄膜的温度和磁场依赖电荷传输性能。使用分子束外延以500 oC在Si底物上生长100 nm厚度的MNP纳米棒膜。温度依赖性电阻率数据在整个测得的温度范围内表现出金属行为。然而，在50 K以下，该系统进入稳定的螺旋（螺钉）磁态，高达12％的大磁磁性。在这种温度状态下，MR（H，T）依赖性似乎显示出操纵相共存的磁场。观察到的磁化率主要由晶间自旋依赖的隧穿机理控制。这些发现指出了此呼吸磁系统中的传输和磁性之间的相关性。
Helical magnets are emerging as a novel class of materials for spintronics and sensor applications; however, research on their charge and spin transport properties in a thin film form is less explored. Herein, we report the temperature and magnetic field dependent charge transport properties of a highly crystalline MnP nanorod thin film over a wide temperature range (2-350 K). The MnP nanorod films of 100 nm thickness were grown on Si substrates at 500 oC using molecular beam epitaxy. The temperature dependent resistivity data exhibits a metallic behavior over the entire measured temperature range. However, large negative magnetoresistance of up to 12% is observed below 50 K at which the system enters a stable helical (screw) magnetic state. In this temperature regime, the MR(H,T) dependence seems to show a magnetic field manipulated phase coexistence. The observed magnetoresistance is dominantly governed by the intergranular spin dependent tunneling mechanism. These findings pinpoint a correlation between the transport and magnetism in this helimagnetic system.
