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Printed magnetic FePt nanocrystal films.
Reken N Patel1, Andrew T Heitsch, Changbae Hyun
1Department of Chemical Engineering, Center for Nano- and Molecular Science and Technology, Texas Materials Institute, The University of Texas at Austin, Austin, Texas 78712, USA.
ACS Applied Materials & Interfaces
|April 2, 2010
Summary
Researchers developed a novel method for printing patterned films of iron-platinum (FePt) nanocrystals using Langmuir-Blodgett assembly and transfer printing. This technique enables the creation of microscale magnetic patterns for potential applications.
Area of Science:
- Materials Science
- Nanotechnology
- Magnetism
Background:
- FePt nanocrystals are promising for magnetic storage due to their high coercivity.
- Controlled assembly and patterning of nanomaterials are crucial for device fabrication.
Purpose of the Study:
- To develop a method for fabricating patterned FePt nanocrystal films.
- To investigate the magnetic properties of these patterned films.
Main Methods:
- Nanocrystal assembly on a Langmuir-Blodgett trough.
- Transfer printing using polydimethylsiloxane (PDMS) stamps.
- Magnetic force microscopy (MFM) for property characterization.
Main Results:
- Successful printing of micrometer-scale patterns (circles, lines, squares).
- Detection of remanent magnetization in multilayer FePt films at room temperature.
- Demonstration of controlled magnetic property mapping.
Conclusions:
- The developed transfer printing technique is effective for creating patterned FePt nanocrystal films.
- Multilayer FePt films exhibit permanent magnetization suitable for magnetic applications.
- This method offers a pathway for fabricating nanoscale magnetic devices.
