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High saturation magnetization soft magnetic iron-cobalt-nickel films for GHz applications.

机译:适用于GHz应用的高饱和磁化软磁铁钴镍薄膜。

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In this work, Fe-Co-N alloy films with the thickness of 100 nm with a Permalloy nano-underlayer (5 nm) have been synthesized and characterized. The Fe-Co-N films have a high saturation magnetization of 2.4 T (24 kG), a low coercivity of less than 80 A/m (1 Oe), a resistivity of 50 μΩ·cm, and an initial permeability of 1000 with a 3dB bandwidth of 1.5 GHz. The combination of high saturation magnetization, low coercivity, and high bandwidth makes the Fe-Co-N thin film a very promising candidate material for magnetic recording heads. An exchange induced ripple reduction mechanism is proposed to explain the observed magnetic softness in the Fe-Co-N films with a Permalloy nano-underlayer. Pulsed inductive magnetometer studies show that the Fe-Co-N films exhibit a ferromagnetic resonance frequency of 2 GHz. The Fe-Co-N films with larger dispersion angles generally show higher damping constants. The susceptibility spectrum of a magnetic thin film is obtained from the Landau-Lifshitz-Gilbert (L-L-G) Equation and is analyzed to obtain the damping criteria for magnetic thin films. The damping criteria for a magnetic thin film with the relative dc susceptibility χ0 = χ(ω = 0) = Ms/(Hk+ Happl) are α > 2χ−1/2, over damped; α = 2χ−1/2, critically damped; and 0 α 2χ−1/2, under damped. Since the actual damping constants for the magnetic thin films are far less than 2χ−1/2, the magnetic thin films are generally observed to be under-damped. A general method of solving the L-L-G equation and the Landau-Lifshitz (L-L) equation in the frequency domain is proposed, and is used to solve the L-L-G equation and the L-L equation for a magnetic sphere and a magnetic thin film. The different harmonic terms of the magnetization are also predicted for a magnetic sphere and a thin film from the L-L-G equation and the L-L equation.
机译:在这项工作中,已经合成并表征了厚度为100 nm的具有坡莫合金纳米底层(<5 nm)的Fe-Co-N合金膜。 Fe-Co-N膜具有2.4 T(24 kG)的高饱和磁化强度,小于80 A / m(1 Oe)的低矫顽力,50μΩ·cm的电阻率和1000的初始磁导率1.5 GHz的3dB带宽。高饱和磁化强度,低矫顽力和高带宽的结合使Fe-Co-N薄膜成为磁记录头非常有希望的候选材料。提出了一种交流感应波纹减小机制来解释在具有坡莫合金纳米底层的Fe-Co-N薄膜中观察到的磁软度。脉冲感应磁强计研究表明,Fe-Co-N薄膜表现出2 GHz的铁磁谐振频率。具有较大分散角的Fe-Co-N膜通常显示较高的阻尼常数。从Landau-Lifshitz-Gilbert(L-L-G)方程获得磁性薄膜的磁化率谱,并对其进行分析以获得磁性薄膜的阻尼准则。相对直流磁化率χ 0 =χ(ω= 0)= M s < / italic> /( H k + H appl )为α>2χ −1/2 ,过度阻尼; α=2χ −1/2 ,临界阻尼;和0 <α<2χ -1/2 ,在阻尼下。由于磁性薄膜的实际阻尼常数远小于2χsuper-1/ 2 ,因此通常观察到磁性薄膜的阻尼不足。提出了一种在频域上求解L-L-G方程和Landau-Lifshitz(L-L)方程的通用方法,并用于求解磁球和磁性薄膜的L-L-G方程和L-L方程。还可以根据L-L-G方程和L-L方程预测磁球和薄膜的磁化强度的不同谐波项。

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