Soft Magnetic Properties of Fe-Hf-N Films Reacted with Bonding Glass

The purpose of this study is to investigate the effect of chemical reaction with a bonding glass on physical and magnetic properties of Fe-Hf-N/SiO$_2$ and Fe-Hf-N/Cr/SiO$_2$ thin films. When the Fe-Hf-N/SiO$_2$ films were reacted with the bonding glass, the soft magnetic properties of them were extremely degraded. At $600^{\circ}C$, the saturation magnetization of the reacted film decreased to 1 kG, and its coercivity increased to 27 Oe, and its effective permeability decreased to 70. It was found that the degradation of soft magnetic properties of the Fe-Hf-N/SiO$_2$ films reacted with the bonding glass were attributed to the oxidation of the Fe-Hf-N layers to HfO$_2$ and Fe$_3$O$_4$. The soft magnetic properties of the Fe-Hf-N/Cr/SiO$_2$ films reacted with the bonding glass were degraded less than those of Fe-Hf-N/SiO$_2$ films. At $600^{\circ}C$, the saturation magnetization of the reacted film decreased to 13.5 kG, and its coercivity increased to 4 Oe, and its effective permeability decreased to 700. It was found that the Cr layer suppressed the oxidation of the Fe-Hf-N layers during the chemical reaction between the Fe-Hf-N layer and bonding glass.

접합유리와 반응된 Fe-Hf-N 박막의 연자기 특성

열처리 온도에 따라 접합유리와의 화학적 반응이 Fe-Hf-N/SiO$_2$, 및 Fe-Hf-N/Cr/SiO$_2$ 박막의 물리적, 자기적 특성에 미치는 영향을 고찰하였다. 접합유리와 반응된 Fe-Hf-N/SiO$_2$ 박막의 연자기 특설은 온도가 증가함에 따라 크게 떨어졌으며, $600^{\circ}C$에서 포화자화값은 1 kG, 보자력이 27 Oe, 10MHz에서의 유효투자율이 70로 자기적 특성이 급격히 열화되었다. 이는 접합유리와의 화학적 반응에 의해 Fe-Hf-N 박막이 H$_{f}$ O$_2$, Fe$_3$O$_4$ 등으로 산화되기 때문인 것으로 나타났다. Fe-Hf-N/Cr/SiO$_2$ 박막의 경우, $600^{\circ}C$에서 포화자화값 13.5kG, 보자력은 4Oe, 10 MHz에서의 유효 투자율이 700으로 Fe-Hf-N/SiO$_2$ 박막보다 연자기 특성 열화가 덜 일어났다. 이는 Fe-Hf-N/Cr/SiO$_2$ 박막의 Cr 층이 Fe-Hf-N 박막의 산화를 억제하여. 일부에서만 HfO$_2$가 생성되고 나머지는 원래의 $\alpha$-Fe상을 유지하기 때문인 것으로 나타났다.