Magnetizing
| 1700 Series | |
| Tilt Range | Up to ±45° depending on objective pole |
| Sample Size |
1x2mm |
| In-plane applied magnetic flux density |
Up to 900 Gauss, depending on microscope and pole piece |
| Electron imaging |
From -300 Oe to +300 Oe applied field depending on microscope and pole piece |
| Beam Deflection |
Integrated passive magnetic compensation |
| TEM Compatibility | TFS/FEI, JEOL, Hitachi |
Overview
Using Hummingbird Scientific’s magnetization holder, scientists can explore how magnetic materials and devices respond dynamically to applied in-plane magnetic fields. Specific applications include studies of the physics of functional magnetic and multiferroic materials such as magnetic alloys, complex oxides, giant/colossal magnetoresistance materials and nanoscale magnetic structures. The magnetization holder is also available in a high-performance version for the dedicated JEOL Lorentz TEM.
Sample Applications:
- Directly visualizing magnetic domain switching
- Observing microstructure interactions with domain-wall motion
- Correlating bulk magnetic measurements with nanoscale processes
How It Works
Using in-plane magnetic fields, Hummingbird Scientific’s magnetizing holder can apply up to +/- 900 Gauss* to the sample area. The system uses a built-in magnetic compensation circuit to limit the magnetic effect on the electron beam, increasing image quality and the maximum usable magnetic field (+/- 300 Oe*). The field is quantified and calibrated at the sample via a miniature field sensor.
Left: (Top) Graph illustrating the maximum applied magnetic field and the maximum field at which imaging is possible. (Bottom) Schematic showing the magnetic field lines for negative applied field. The magnetic compensation circuit guides the field around and applies an opposite field above and below the sample position. Colored image to the left shows FEA results of the magnetic fields at the sample.
* Depending on microscope type and pole piece
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Real-space observation of magnetic excitation in quasicrystal lattices
Magnetic reversal mechanism of quasicrystal artificial spin ice were studied with in-situ TEM magnetizing experiments. Using this technique, a team from Argonne National Lab found a new dendritic magnetic reversal mechanism in the quasicrystal spin ice lattitces. “As fabricated” and “Demagnetized” schematics show examples of the groups of magnetic bars whose magnetization reversed at each of the two field values.
Reference: A. K. Petford-Long et al. Nanoparticle Interactions Guided by Shape‐Dependent Hydrophobic Forces. Scientific Reports (2016). Abstract
Copyright © 2016 Macmillan Publishers Limited, part of Springer Nature
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Magnetic induction maps for quasicrystal lattice in the as-fabricated and demagnetized states. The color wheel shows the magnetization direction. Image copyright ©2016 Macmillan Publishers Limited, part of Springer Nature.
| V. Brajuskovic, F. Barrows, C. Phatak & A. K. Petford-Long. “Real-space observation of magnetic excitations and avalanche behavior in artificial quasicrystal lattices,” Scientific Reports (2016) | Abstract |
| S. Zhang, A. K. Petford-Long, and C. Phatak. “Creation of artificial skyrmions and antiskyrmions by anisotropy engineering,” Scientific Reports (2016) | Abstract |
| A. Budruk, C. Phatak, A.K. Petford-Long, and M. De Graef. “In-situ Lorentz TEM magnetization studies on a Fe-Pd-Co martensitic alloy,” Acta Materialia (2011) | Abstract |
| A. Budruk, C. Phatak, A.K. Petford-Long, and M. De Graef. “In-situ Lorentz magnetization study of a Ni-Mn-Ga ferromagnetic shape memory alloy,” Acta Materialia (2011) | Abstract |
| A. Budruk, C. Pathak, A. Petford-Long, and M. De Graef. “In-situ Lorentz TEM Study of Magnetic Domain Wall Mobility in Amartensitic Ni-Mn-Ga Alloy,” Microscopy and Microanalysis (2011) | Abstract |
| A. Budruk, C. Phatak, A.K. Petford-Long, and M. De Graef. “Domain Observations in Fe-Pd-Co by Dynamic in-situ Lorentz TEM,” Microscopy and Microanalysis (2010) | Abstract |
| M. De Graef. “Recent Progress in Lorentz Transmission Electron Microscopy,” 8th European Symposium on Martensic Transformations (2009), Keynote Lecture | Abstract |
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