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Piezomagnetic ε-Fe2O3 crystals

A new synthesis method to produce ε-Fe2O3 nanoparticles and its processing under high pressures and temperatures.


ε-Fe2O3 presents a large magnetic anisotropy that makes it interesting for technological applications related to magnetic memories and to the development of self-biased non-reciprocal devices which are appealing for the forthcoming generations of wireless communications.

ε-Fe2O3 nanoparticles should be above 25 nm to retain their magnetization. There are several methods to prepare these nanoparticles, but none of them is scalable, making impossible an industrial application.

We present a new method for the synthesis of piezomagnetic ε-Fe2O3 nanoparticles of sizes above 25 nm. The nanoparticles can be used for the manufacturing of magnetic memories or wireless communication devices as self-biased non-reciprocal devices, such as miniaturized circulators for highfrequency (above 100 GHz) wireless communications.