$J_{C}(d_{F})$ with $d_{F}$ increase.

Mode (2): SInFS junction $d_{s}\leq d_{sc}$
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For $d_{s}\leq d_{sc}$ intrinsic superconductivity in the $s$ layer is completely suppressed resulting in formation of the complex -InF- weak link area, where ’n’ marks the intermediate s film in the normal state. In this parameter range the weak is always located in the tunnel barrier and the CPR has sinusoidal shape $$J_{S}(\varphi )=\frac{J_{G}}{\sqrt{2}}\frac{\left( p-q\right) \sin \varphi }{2pq\Gamma \Gamma _{BI}\cos \frac{d_{s}}{\xi _{s}(T)}+\left[ 2pq\Gamma
+\left( p+q\right) \Gamma _{BI}\right] \sin \frac{d_{s}}{\xi _{s}(T)}}.
\label{I_ot_fi_small_ds1}$$In a vicinity of the critical thickness, $d_{s}\lesssim d_{sc},$ the factor $\cos (d_{s}/\xi _{S}(T))$ in (\[I\_ot\_fi\_small\_ds1\]) is small and supercurrent is given by the expression $$J_{S}(\varphi )=\frac{J_{G}}{2\sqrt{2}}\frac{\left( p-q\right) \sin \varphi
}{2pq\Gamma +\left( p+q\right) \Gamma _{BI}}.  \label{curInter}$$ Further decrease of $d_{s}$ into the limit $d_{s}\ll d_{sc}$ leads to $$J_{S}(\varphi )=\frac{J_{G}}{\sqrt{2}}\frac{\left( p-q\right) \sin \varphi }{2pq\Gamma \Gamma _{BI}}.  \label{curSInFS}$$The magnitude of critical current in (\[curSInFS\]) is close to that in the well-known case of SIFS junctions in appropriate regime.

Current-Phase Relation \[SecCPR\]
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In the previous section we have demonstrated that the variation in the thickness of the ferromagnetic layer should lead to the transformation of CPR of the SIsFS structure. Fig.\[CPR\]a illustrates the $J_{C}(d_{F})$ dependencies calculated from expressions (\[JatIS1\])-(\[EqDsmall1\]) at $T=0.9T_{C}$ 