Magnetic properties of individual Co(2)FeGa Heusler nanoparticles studied at room temperature by a highly sensitive co-resonant cantilever sensor.
Magnetic properties of individual Co(2)FeGa Heusler nanoparticles studied at room temperature by a highly sensitive co-resonant cantilever sensor.
复制标题
单个CO（2）Fega Heusler纳米颗粒在室温下通过高度敏感的悬臂传感器研究的磁性特性。
DOI：
10.1038/s41598-017-08340-z
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发表时间：
2017-08-21
影响因子：
4.6
通讯作者：
Mühl T
中科院分区：
文献类型：
--
作者：
Körner J;Reiche CF;Ghunaim R;Fuge R;Hampel S;Büchner B;Mühl T
研究纳米粒子的性质是为生物技术、医学和磁存储技术等许多研究领域的进步和新应用铺平道路的一项重要任务。纳米颗粒的研究对常用的方法和技术是一个挑战。它需要越来越复杂的测量设置，通常是低温和相应传感器的尺寸减小，以达到必要的灵敏度和分辨率。在这里，我们展示了如何在室温下测量单个纳米颗粒的磁性能，并使用传统的扫描力显微镜装置结合共谐振悬臂磁强计方法。我们研究了在碳纳米管中封装直径为35 nm的Co2FeGa Heusler纳米颗粒。我们首次通过简单的激光偏转检测，观察到这些纳米颗粒在外磁场中的磁开关。此外，我们能够推断出这些纳米颗粒的磁性能，这与先前在其他实验中获得的大纳米颗粒集合的结果非常一致。为了做到这一点，我们将悬臂磁强计中频移信号的分析描述扩展为更一般的公式，考虑到相对于磁场的未对准传感器振荡方向。
The investigation of properties of nanoparticles is an important task to pave the way for progress and new applications in many fields of research like biotechnology, medicine and magnetic storage techniques. The study of nanoparticles with ever decreasing size is a challenge for commonly employed methods and techniques. It requires increasingly complex measurement setups, often low temperatures and a size reduction of the respective sensors to achieve the necessary sensitivity and resolution. Here, we present results on how magnetic properties of individual nanoparticles can be measured at room temperature and with a conventional scanning force microscopy setup combined with a co-resonant cantilever magnetometry approach. We investigate individual Co2FeGa Heusler nanoparticles with diameters of the order of 35 nm encapsulated in carbon nanotubes. We observed, for the first time, magnetic switching of these nanoparticles in an external magnetic field by simple laser deflection detection. Furthermore, we were able to deduce magnetic properties of these nanoparticles which are in good agreement with previous results obtained with large nanoparticle ensembles in other experiments. In order to do this, we expand the analytical description of the frequency shift signal in cantilever magnetometry to a more general formulation, taking unaligned sensor oscillation directions with respect to the magnetic field into account.
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