Abstract
The effects of Ga composition (x) on soft and high-frequency magnetic properties of 10-nm-thick B-doped Fe–Ga (Fe85.1−xGaxB14.9) thin films were investigated. A uniaxial magnetic anisotropy appeared regardless of the Ga composition. The damping constant values and magnetic inhomogeneous broadening at a zero frequency were much lower than those of the Fe–Ga polycrystalline film for all Ga compositions. These results indicate that adding B atoms to Fe–Ga thin films improves the soft and high-frequency magnetic properties of these films and suggest that Fe–Ga–B thin films are candidate magnetostrictive materials for high-frequency devices.
Highlights
The magnetoelectric (ME) effect has attracted considerable attention for next-generation electromagnetic devices such as ferromagnetic/ferroelectric multiferroic devices from the application point of view
By contrast, applying an external magnetic field in the lateral direction of the film tends to decrease Mr/Ms from 0.50 to 0.30 as the Ga composition increases, except for a Ga composition of 26.3 at.%. These results suggest that all Fe–Ga–B thin films possess an in-plane uniaxial magnetic anisotropy and that the magnetic anisotropy becomes stronger as the Ga composition increases. 4πMs slowly increases from 11.5 kG to 12.5 kG for a Ga composition up to 21.8 at.%, but decreases to approximately 9.0 kG for the Ga composition between 21.8 at.% and 27.7 at.%
The changes in the structure along with the soft and highfrequency magnetic properties of 10-nm-thick Fe85.1-xGaxB14.9 thin films were investigated as functions of the Ga compositions (x)
Summary
The magnetoelectric (ME) effect has attracted considerable attention for next-generation electromagnetic devices such as ferromagnetic/ferroelectric multiferroic devices from the application point of view. To realize such devices, ferromagnetic materials with a large saturation magnetostriction at a low magnetic field and a narrow ferromagnetic resonance (FMR) linewidth (i.e., magnetostrictive materials) must be developed.. Terfenol-D (Tb1−xDyxFe2) and Galfenol (Fe81Ga19, Fe–Ga) alloys are well–known magnetostrictive materials. For Terfenol-D, its saturation magnetostriction is 1600 ppm, which is sufficiently large, but a high magnetic field is necessary to obtain a saturation magnetostriction. Fe–Ga alloys possess a high saturation magnetostriction of 400 ppm at a low magnetic field and display excellent mechanical properties.. Fe–Ga polycrystalline films, which can be fabricated industrially, have been investigated by several groups, including ours.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
