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Materials Science
Differential Phase Contrast Imaging
Differential phase contrast microscopy for magnetic material analysis on scanning transmission electron microscopes.
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DPC imaging
Modern electronics research often relies on nanometer-scale characterization of electric and magnetic properties. Differential phase contrast STEM (DPC-STEM) is used to perform such tasks, allowing you to image the strength and distribution of magnetic fields in and around your sample, and directly display the magnetic domain structure. What makes this technique so valuable is its ability to directly image complex materials used in data storage and electronic devices.
Differential phase contrast microscopy
DPC-STEM has applications in a number of research areas. In the field of spintronics, it is often important to determine the micro-magnetic state of sub-micrometer patterned magnetic materials. In optoelectronics, quantum wells in non-centrosymmetric materials cause strong piezoelectric fields that modify the band structure of these devices. These spintronics and optoelectronics materials require thorough characterization to be fully understood, a capability unique to DPC-STEM.
The technique is not just limited to magnetic samples. Polarized materials and films exert a similar influence on the electron beam as materials containing an intrinsic electric field. DPC-STEM can reveal critical information on the charge distribution of bonds, across interfaces, and at surfaces, potentially leading to the discovery of new aspects of a material’s physical properties.
DPC-STEM is available on Thermo Scientific Talos S/TEM and Spectra S/TEM platforms with the four-segment design of the (Panther) STEM Detector. Combined with Thermo Scientific Velox Software, these instruments give you the option of live DPC acquisition that’s fully integrated into the user interface.
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DPC-STEM can provide quantitative information about the field orientation in a magnetic structure. Here, the field orientation for a hexaferrite sample is shown in a color-wheel representation. Sample courtesy of H. Nakajima and S. Mori, Osaka Prefecture University.
Arrow map representations of the strength and orientation of the magnetic field in a hexaferrite sample. Sample courtesy of H. Nakajima and S. Mori, Osaka Prefecture University.
DPC-STEM can provide quantitative information about the field orientation in a magnetic structure. Here, the field orientation for a hexaferrite sample is shown in a color-wheel representation. Sample courtesy of H. Nakajima and S. Mori, Osaka Prefecture University.
Arrow map representations of the strength and orientation of the magnetic field in a hexaferrite sample. Sample courtesy of H. Nakajima and S. Mori, Osaka Prefecture University.
Fundamental Materials Research
Novel materials are investigated at increasingly smaller scales for maximum control of their physical and chemical properties. Electron microscopy provides researchers with key insight into a wide variety of material characteristics at the micro- to nano-scale.
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