  We have designed a new magnetic bed structure with desirable table-like
magnetocaloric effect (MCE) by using three kinds of soft ferromagnetic Gd-Al-Co
microwire arrays with different Curie temperatures ($T_C$). The $T_C$ interval
of these three wires is ~10 K and the designed new structure named Sample A.
This sample shows a smooth table-like magnetic entropy change ($\Delta S_M$) at
high applied field change ($\mu_0 \Delta H=5 T$) ranging from ~92 K to ~107 K.
The maximum entropy change ($-\Delta S_M^{\rm max}$) and refrigerant capacity
(RC) for Sample A at $\mu_0 \Delta H=5 T$ are calculated to be ~9.42
Jkg$^{-1}$K$^{-1}$ and ~676 Jkg$^{-1}$. The calculated curves of $-\Delta
S_M(T)$ and the corresponding experimental data match well with each other,
suggesting that the desirable magnetocaloric properties of the microwire arrays
can be designed. Simulation shows that the RC values of the designed systems
increase when increasing the interval of $T_C$. The table-like MCE and the
enhanced heat-transfer efficiency due to the enhanced surface areas of the
microwires make this newly designed magnetic bed very promising for use in
energy-efficient magnetic refrigerators.
