The reporter learned from the strong magnetic field science center of the Chinese Academy of Sciences that the Xue Fei research team at the center has achieved the first experimental measurement of the magnetization process of non-specific shape nano-samples in the world for the first time. The research team proposed and implemented a new nano-sample transfer assembly method. Using a self-developed dynamic cantilever magnetic measurement device, the single magnetic domain change in the nano-particle sample was successfully observed. The research results were published online in "Physical Application Review" a few days ago.
The dynamic cantilever magnetic measurement device uses a sensitive cantilever beam to measure the sample angular momentum change accompanying the sample magnetic change. Due to the characteristics of its working principle, there is no special requirement for the shape and conductivity of the sample to be tested, and it is a very small sample magnetic characterization technology with great application potential. Previously, in the field of international scope, due to the lack of effective nano sample transfer and assembly methods, the object of the dynamic cantilever magnetometer experiment was limited to one-dimensional nanowires and nanotubes.
Nanomagnetic structures have important applications in many research and industrial fields, such as topological magnetism, low-dimensional magnetism, high-density magnetic recording, magnetic sensors and biomedical applications. In these studies and applications, the quantitative analysis of the magnetic anisotropy, coercivity, and saturation magnetization of the nanomagnetic structure is very important. Limited by the sensitivity of magnetic detection, commercial vibrating magnetometers cannot resolve changes in the magnetic moment of a single nanometer sample. To obtain sufficient signal strength, commercial vibrating magnetometers need to measure millions of samples at the same time, and only the average properties and parameters of these nano samples can be obtained. Therefore, in-depth study of nanomagnetism requires characterization of the magnetic properties of a single nanosample.
The nano sample transfer assembly method implemented by Xue Fei's research team utilizes a focused ion beam (FIB) -scanning electron microscope (SEM) dual-beam system and nano manipulator to reliably transfer nano samples of any shape to ultra-sensitive torque detection On the micro-nano cantilever. Using this technology, the research team successfully detected the magnetic domain inversion in a single nano sample with a diameter of less than 100 nanometers, and achieved a sensitivity to magnetic moment detection of the order of 1 × 10-15 emu, which is 10 million better than the commercial vibration magnetometer. Times. (Reporter Wu Changfeng)
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