标题： 非晶态 Tb$_{31}$Co$_{69}$和 Dy$_{31}$Co$_{69}$薄膜在硅基底上的磁性和磁热性能 显示英文标题

标题： Magnetic and magnetocaloric properties of the amorphous Tb$_{31}$Co$_{69}$ and Dy$_{31}$Co$_{69}$ thin films deposited on Si substrates

摘要： 我们展示了非晶薄膜Tb-Co和Dy-Co的结构、磁性和磁卡性质，其化学计量比为Tb$_{31}$Co$_{69}$和Dy$_{31}$Co$_{69}$，沉积在自然氧化的硅Si (100)基底上。 厚度为$d=50$nm的样品覆盖有厚度为$d_{\rm Au} =5 $nm的保护性金层，采用脉冲激光沉积技术制备。 X射线衍射分析表明所制备材料中存在结晶化的Laves相。 作为温度函数的磁化测量结果显示两种样品均表现出铁磁性行为。 我们估算了非晶相的补偿温度$T_{\rm comp}$，对于 Tb$_{31}$Co$_{69}$在 81.5 K，对于 Dy$_{31}$Co$_{69}$在 88.5 K，而我们发现结晶的 Laves 相的居里温度$T_{\rm C,\ Laves}$分别为 204.5 K 和 117 K。 我们研究了在宽温度范围内磁热效应，涵盖了非晶相的$T_{\rm comp}$和结晶Laves相的$T_{\rm C,\ Laves}$。 The analysis for the magnetic field change of $\Delta \mu_0H=5$ T showed values of the magnetic entropy change of $-\Delta S_{\rm M}=4.9$ mJ cm$^{-3}$ K$^{-1}$ at $T_{\rm comp}$ and $-\Delta S_{\rm M}=6.6$ mJ cm$^{-3}$ K$^{-1}$ at $T_{\rm C,\ Laves}$ for Tb$_{31}$Co$_{69}$, while for Dy$_{31}$Co$_{69}$, we determined the values of $-\Delta S_{\rm M}=35$ mJ cm$^{-3}$ K$^{-1}$ at $T_{\rm comp}$ and $-\Delta S_{\rm M}=28$ mJ cm$^{-3}$ K$^{-1}$ at $T_{\rm C,\ Laves}$. 显示英文摘要

摘要： We present the structural, magnetic, and magnetocaloric properties of amorphous thin films Tb-Co and Dy-Co with stoichiometry Tb$_{31}$Co$_{69}$ and Dy$_{31}$Co$_{69}$, deposited on naturally oxidized silicon Si (100) substrates. Samples with a thickness $d=50$ nm covered with a protective Au overlayer with a thickness $d_{\rm Au} =5 $ nm were produced using the pulsed laser deposition technique. The X-ray diffraction analysis indicated the presence of a crystallized Laves phase in the prepared materials. Magnetization measurements as a function of temperature revealed ferrimagnetic behavior in both samples. We estimated the compensation temperature $T_{\rm comp}$ of the amorphous phase for Tb$_{31}$Co$_{69}$ at 81.5 K and for Dy$_{31}$Co$_{69}$ at 88.5 K, while we found the Curie temperature $T_{\rm C,\ Laves}$ of the crystallized Laves phases at 204.5 K and at 117 K, respectively. We investigated the magnetocaloric effect in a wide temperature range, covering $T_{\rm comp}$ of amorphous phases and $T_{\rm C,\ Laves}$ of crystallized Laves phases. The analysis for the magnetic field change of $\Delta \mu_0H=5$ T showed values of the magnetic entropy change of $-\Delta S_{\rm M}=4.9$ mJ cm$^{-3}$ K$^{-1}$ at $T_{\rm comp}$ and $-\Delta S_{\rm M}=6.6$ mJ cm$^{-3}$ K$^{-1}$ at $T_{\rm C,\ Laves}$ for Tb$_{31}$Co$_{69}$, while for Dy$_{31}$Co$_{69}$, we determined the values of $-\Delta S_{\rm M}=35$ mJ cm$^{-3}$ K$^{-1}$ at $T_{\rm comp}$ and $-\Delta S_{\rm M}=28$ mJ cm$^{-3}$ K$^{-1}$ at $T_{\rm C,\ Laves}$.