Control of Structural and Magnetic Properties of Polycrystalline Co2FeGe Films via Deposition and Annealing Temperatures

Abstract

Thin polycrystalline Co2FeGe films with composition close to stoichiometry have been fabricated using magnetron co-sputtering technique. Effects of substrate temperature (TS) and post-deposition annealing (Ta) on structure, static and dynamic magnetic properties were systematically studied. It is shown that elevated TS (Ta) promote formation of ordered L21 crystal structure. Variation of TS (Ta) allow modification of magnetic properties in a broad range. Saturation magnetization ~920 emu/cm3 and low magnetization damping parameter α ~ 0.004 were achieved for TS = 573 K. This in combination with soft ferromagnetic properties (coercivity below 6 Oe) makes the films attractive candidates for spin-transfer torque and magnonic devices.

Magnetic Properties of Fe$_2$CrGa Heusler Alloy Films

“…on the film structure) were also shown by Xie et al [5]. The atomic disorder upon L21 to A2 order type transition in Co2FeGe HA films leads to about 15% room temperature (RT) saturation magnetization reduction [7]. Kostenko and Lukoyanov theoretically considered the effect of atomic disorder on the electronic structure and magnetic properties of Fe2VAl and Co2CrAl HAs.…”

“…In a disordered state, these «ferromagnetic» atoms can create their own clusters. A strong influence of the atomic order on the magnetic properties of HA has been shown experimentally and explained using the result of the first-principal calculations of the electronic structure and magnetic properties of HAs [2,[4][5][6][7][8][9][10][11][12][13][14].…”

Investigation on the crystal structure, magnetic, and electrical transport properties of magnetron sputtered Co2FeGe Heusler alloy films

“…These factors make this alloy one of the attractive candidates for spintronic applications. Even though reports on structural, magnetic [17,18], optical [19], and tunnel magnetoresistance [20] characteristics have been reported on Co2FeGe films, a systematic study on the influence of sputtering parameters such as sputtering pressure and substrate temperature on the physical properties of the films has not been reported so far. Since the alloy possesses an L21 crystal structure, high Curie temperature, and high saturation magnetic moment, we are motivated to do an investigation on the dependence of structural, magnetic, and electrical transport properties on the sputtering parameters.…”

Spontaneous nucleation of vortex–antivortex pairs in confined magnetic microstructures

“…Magnetic nanomaterials received much attention from both basic and applied points due to interesting physical phenomena caused by the size effect [1,2]. In particular, soft magnetic materials are promising for spintronic applications including information storage, logic devices, and high-frequency electronics [3][4][5].…”