On the relation between the effective ferromagnetic resonance linewidth Δfeff and damping parameter αeff in ferromagnetic Fe–Co–Hf–N nanocomposite films

FeCoHfN thin films fabricated by co-sputtering with high resonance frequency

“…Nowadays, as the operating frequency in many devices reaches gigahertz, for instance the typical frequencies for Bluetooth technology are 2.4 and 5.8 GHz, the need for magnetic thin films with high resonance frequency is indispensable [2,3]. Among various materials, thin films based on FeCo alloy such as FeCoN [1], FeCoB [5][6][7], FeCo-SiO 2 [2,8], FeCo-Al 2 O 3 [9], FeCo-SiN [10], FeCo-HfO [11] and FeCo-HfN [12,13] have received much attention due to their relatively high saturation magnetization. In this paper, we report the investigation of magnetic dynamic properties of FeCoHfN thin films grown by co-sputtering of FeCo and Hf.…”

Determination of intrinsic FMR line broadening in ferromagnetic (Fe44Co56)77Hf12N11 nanocomposite films

“…The composition was measured by electron probe micro-analysis (EPMA) and Auger electron spectroscopy (AES). TEM was used to identify phases and the grain size of the film material [9]. A nanocrystalline bcc and fcc structure for Fe-Co and Hf-N was found, respectively.…”

“…Provided that the frequency dependent permeability is well described by the Landau-Lifschitz-Gilbert differential equation with its characteristic Gilbert damping parameter a eff ¼a int + a ext one can constitute the relation between a int and Df int according to Ref. [9]:…”

Combining Sensor and Protective Functionalities in Ferromagnetic Nanocomposite Thin Films for Applications in Harsh Environments

“…The constitution of as deposited Fe-Co and temperature treated Fe-Co-Hf-N single films are well known [22,23] Especially in the latter system, a Fe-Co phase and a refractory Hf-N develops which can be expected due to a much higher standard enthalpy of formation DH of Hf-N (%À369 kJ mol À1 ) in comparison to Fe-Co (%À2.5 kJ mol À1 ). Beyond that Hf-N acts as a "grain reducer" for Fe-Co.…”