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(a) Properties of as-deposited Fe1−x V x alloyed films: MOKE hysteresis loops for the films with different compositions (wt. % V), x, and plotting the saturation magnetization 4πM s versus x (inset). (b) Optical scheme for direct laser interference patterning with the femtosecond laser. The notations used are as follows: BS is beam splitter, M1a ((b), (c)) and M2a ((b), (c)) are mirrors for beams 1 and 2, FL1(2) are focusing lenses. Mirror M2a was mounted on a translation stage for finding overlapping in time by adjusting a time delay between the beams.
(a) MFM and (b) topographic images of a 20-nm thick Fe-25 wt. % V layer patterned with two interfering beams of femtosecond laser (0.5 J/cm2; 103 shots). The MFM response (left) and topographic height (right) profiles along the vertical direction are shown on top. The grating period corresponds to that of the interference pattern Λ = 0.7 μm. A sketch of periodically arranged magnetic poles, N and S, is at the bottom of the MFM image.
Maximal MOKE intensity, Δφk, as function of number of shots at different values of laser fluence in J/cm2. (b) Normalized MOKE hysteresis loops measured for a film location patterned with 103 shots. The loops are taken with an external field applied along the stripes (easy direction, solid red line) and transverse to them (hard direction, solid blue line). Between the ∼15-Oe and 60-Oe fields, as indicated with dashed circle, magnetizations in adjacent stripes are oriented in opposite directions.
(a) Small angle x-ray diffraction of the as-deposited alloy and after its treatment by Nd:YAG laser with different fluences given in J/cm2. These spectra indicate the growth of concentration waves around 5-nm-wavelength, as it is explicitly shown in the inset. (b) Fragment of Fe-V phase diagram indicating the decomposition into magnetic (α) and nonmagnetic (σ) phases inside the two-phase region. (c) Cross-section of the patterned grating with compositionally modulated structure inside patterned regions (schematic view).
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