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Citation:Anthony, R., Hegarty, M., Brien, J. O., Rohan, J. F. and Ó. Mathúna, S. C. (2017) 'Enhanced In-Plane Anisotropy and Ferromagnetic Resonance Frequency in Permalloy Films Laminated With Nitrogen-Doped Tantalum', IEEE Magnetics Letters, 8, pp. 1-4. doi: 10.1109/LMAG.2016.2639471
Soft magnetic materials are used in integrated power magnetic devices (such as micro-inductors and microtransformers) to achieve reasonable inductances at frequencies over a few megahertz. However, the out-of-plane (perpendicular) anisotropy, in thick films produced by vapor deposition, worsens the in-plane soft magnetic properties. This paper reports on the nano-lamination of Permalloy (Ni81Fe19) thin films with the introduction of nitrogen-doped tantalum in between to eliminate the out-of-plane anisotropy and improve the in-plane anisotropy. This significantly improves the in-plane soft magnetic properties, reducing the coercivity from 1352 A/m to 25.5 A/m and increasing the anisotropy field from 180 A/m to 660 A/m. The high-frequency permeability was uniform up to 500 MHz, and the ferromagnetic resonance (FMR) frequency was increased to 1 GHz. These properties are ideal for high efficiency magnetic applications at high frequencies and an extended FMR frequency is imperative for gigahertz-range devices.
Maity, Tuhin; Roy, Saibal(Institute of Electrical and Electronics Engineers (IEEE), 2017-03-21)
We demonstrate how a unique nanomodulation within a continuous ferromagnetic film can induce magnetic dipoles at predefined, submicrometer scale locations, which can tune the global magnetic properties of the film due to ...
Roy, Saibal; Mallick, Dhiman; Kankana, Paul(Institute of Electrical and Electronics Engineers (IEEE), 2019-02-20)
This paper discusses the current state-of-the-art, ongoing fundamental and technical challenges and potential roadmaps for micro-scale vibration energy harvesting and power conversion devices employing micro-/nano-magnetics. ...
Le, Hoa Thanh; Nour, Yasser; Pavlovic, Zoran; Ó Mathúna, S. Cian; Knott, Arnold; Jensen, Flemming; Han, Anpan; Kulkarni, Santosh; Ouyang, Ziwei(Institute of Electrical and Electronics Engineers (IEEE), 2018-06-14)
The integration of power inductors is a roadblock in realizing highly miniaturized power supply in package (PSiP) and power supply on chip. Inductors in such power systems are used for energy storage and filtering, but ...
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