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Research Highlight | Center for Nanoscale Materials

Scientists exceed detection limits with new spin on magnetic particles

In a recent study published in Nanoscale, researchers show that an irreversible transition between strongly non-collinear and single domain states translate into a nonlinear magnetic response that enables ultrasensitive detection.

Scientific Achievement

We introduce magnetic disks with engineered properties that enhance remote detection capabilities of magnetic particle imaging far beyond what is currently available using iron oxide nanoparticles.

Significance and Impact

Engineering properties of magnetic disks can boost noise-free detection of magnetic tags in high background environments for applications ranging from biosensing and medical imaging to anti-counterfeit technologies.

Research Details

  • Optical lithography and magnetron sputtering were used to create disk-shaped magnetic dots, with some variations in method depending on sample use (in vivo or ex vivo).
  • Center for Nanoscale Materials resources used include optical lithography, clean room and fabrication, wet chemistry, and post-fabrication processing (lift-off).

DOIhttps://​doi​.org/​10.1039/C8NR01511B 

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Work was performed in part at the Center for Nanoscale Materials.

Magnetic disks in different levels of magnetic fields. When a large magnetic field is applied, the magnetization level reaches saturation and the sample becomes uniformly magnetized (left or right). After the large magnetic field is removed, the disk has no magnetic moment (center).

About Argonne’s Center for Nanoscale Materials
The Center for Nanoscale Materials is one of the five DOE Nanoscale Science Research Centers, premier national user facilities for interdisciplinary research at the nanoscale supported by the DOE Office of Science. Together the NSRCs comprise a suite of complementary facilities that provide researchers with state-of-the-art capabilities to fabricate, process, characterize and model nanoscale materials, and constitute the largest infrastructure investment of the National Nanotechnology Initiative. The NSRCs are located at DOE’s Argonne, Brookhaven, Lawrence Berkeley, Oak Ridge, Sandia and Los Alamos National Laboratories. For more information about the DOE NSRCs, please visit https://​sci​ence​.ener​gy​.gov/​b​e​s​/​s​u​f​/​u​s​e​r​-​f​a​c​i​l​i​t​i​e​s​/​n​a​n​o​s​c​a​l​e​-​s​c​i​e​n​c​e​-​r​e​s​e​a​r​c​h​-​c​e​n​ters/.

Argonne National Laboratory seeks solutions to pressing national problems in science and technology. The nation’s first national laboratory, Argonne conducts leading-edge basic and applied scientific research in virtually every scientific discipline. Argonne researchers work closely with researchers from hundreds of companies, universities, and federal, state and municipal agencies to help them solve their specific problems, advance America’s scientific leadership and prepare the nation for a better future. With employees from more than 60 nations, Argonne is managed by UChicago Argonne, LLC for the U.S. Department of Energy’s Office of Science.

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