Orientation control in L10 FePt films by using magnetic field annealing around Curie temperature

Effects of high magnetic field annealing on FePt nanoparticles with shape-anisotropy and element-distribution-anisotropy

“…The disorder-order transition temperature of FePt alloys could be decreased by applying the HMF, 25 which means that the spheroidization process and the phase-transition process may occur simultaneously under the HMF. This is benecial to the formation of L1 0 phase during the temperature-raising process at 6 and 12 T. Otherwise, in the phasetransition process (holding at 700 C), the ordering diffusion of Fe/ Pt atoms will be enhanced by the HMF induced magnetization energy, [21][22][23][24][25][26] which effect is positively correlated with the HMF strength and leads to the increasing of ordering degree and content of L1 0 -FePt phase. However, as the Fe/Pt atoms ratio of the annealed FePt NPs is far from 1/1, only a very small amount of L1 0 -FePt NPs with lower orderly degree can be obtained.…”

“…The morphology of lms, 14,15 growth rates of crystals, [16][17][18][19] and solid-state phase transformation [20][21][22] are reported to be regulated by the HMF. For the FePt alloys, the HMF annealing has been reported to induce strain in Fe 3 Pt alloy, 23 promote disorder-order transformation of FePt nanomaterials, [24][25][26] and alignment of FePt spherical NPs. [27][28][29] Therefore, if the HMF is applied to anneal the FePt NPs with both the shape-anisotropy and the element-distributionanisotropy, the inuences of the HMF on the NPs in the annealing processes might be claried.…”

Formation of the Ordered $L1_0$-FePt Phase in Fe$_{50}$Pt$_{50}$/Au/Fe$_{50}$Pt$_{50}$ Films at Annealing in Hydrogen

“…Знімання проводили у випроміненні мідної аноди. Ступінь упорядкування фази L1 0 -FePt оцінювалася по відношенню інтенсивностей дифракційних рефлексів I(001)/I(002) [13]. Ступінь орієнтації вісі легкого магнетування у напрямку [001] по відношенню до нормалі до поверхні визначалася по відношенню інтенсивности рефлексів I(001)/I(111) [14].…”

Improving the performance of nickel-coated fluorine-doped tin oxide thin films by magnetic-field-assisted laser annealing

“…Laser annealing outperforms furnace annealing in enhancing work efficiency, avoiding damage of substrates, preventing escape of doping elements in the films and restraining diffusion of impurities from the substrates [12,13], and therefore should be taken as a preferable method for performance optimization of the films. On the other hand, it is noteworthy that magnetic field annealing performed in a furnace has been extensively investigated [14][15][16][17][18][19][20][21][22], but laser annealing in a magnetic field has rarely been reported yet. As indicated in previous researches [15,17], the magnetic field applied during furnace annealing process can affect surface morphology, microstructure, grain size, defects, preferred orientation and even physical properties of various thin films.…”

“…On the other hand, it is noteworthy that magnetic field annealing performed in a furnace has been extensively investigated [14][15][16][17][18][19][20][21][22], but laser annealing in a magnetic field has rarely been reported yet. As indicated in previous researches [15,17], the magnetic field applied during furnace annealing process can affect surface morphology, microstructure, grain size, defects, preferred orientation and even physical properties of various thin films. Since Ni possesses the characteristic of ferromagnetism, it is expected that the magnetic field based on the roles of magnetization energy and magnetic force can help form a more compact Ni layer, which will result in higher transmittance and conductivity of the Ni-coated films.…”