Materials belonging to the family of dilute¹（稀释的） magnetic oxides (DMOs) -- an oxide-based variant² of the dilute magnetic semiconductors³ -- are good candidates for spintronics（自旋电子学） applications. This is the object of study for Davide Sangalli of the Microelectronics and Microsystems Institute (IMM) at the National Research Council (CNR), in Agrate Brianza, Italy, and colleagues. They recently explored the effect of iron (Fe) doping on thin films of a material called zirconia (ZrO2 oxide). For the first time, the authors bridged the gap between the theoretical predictions and the experimental measurements of this material, in a paper about to be published in The European Physical Journal B.

 

Spintronics exploit an intrinsic（本质的） property of the electrons found in semi-conductors called spin, akin⁴ to the electrons' degree of freedom. This determines the magnetic characteristics, known as magnetic moment, of the material under study. The challenge is to create such material with the highest possible temperature, as this will ensure that its magnetic properties can be used in room-temperature applications.

 

To study iron-doped zirconia, they examined its magnetic properties and its electronic structure from both a theoretical and experimental perspective. They then compared theory and experiments to find the most stable configuration⁵ of the material. Theoretical work included first-principles simulations. In parallel, their experimental work relied on many different well-established analytical⁶ techniques, including X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, and alternating gradient（交变梯度磁场） force magnetometer measurements.

 

Sangalli and colleagues therefore gained a better understanding of doped zirconia, which features oxygen vacancies⁷, playing a crucial role in providing its unique electronic and magnetic characteristics. They have also predicted theoretically how the deviation⁸ from the standard structure influences this material's properties. They are currently investigating, experimentally, how the magnetism⁹ evolves with changing concentrations of iron and oxygen vacancies to confirm theoretical predictions.

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