A novel class of antiferromagnets, dubbed altermagnets, exhibit a nonrelativistically spin-split band structure reminiscent of the order parameter phase $d$-wave superconductors, despite the absence of net magnetization. This unique characteristic enables utilization in cryogenic stray-field-free memory devices, offering the possibility of achieving high storage densities. We here determine how a proximate altermagnet influences the critical temperature $T_c$ of a conventional $s$-wave singlet superconductor. Considering both a bilayer and trilayer, we show that such hybrid structures may serve as stray-field-free memory devices where the critical temperature is controlled by rotating the Néel vector of one altermagnet, providing infinite magnetoresistance. Furthermore, our study reveals that altermagnetism can coexist with superconductivity up to a critical strength of the altermagnetic order as well as robustness of the altermagnetic influence on the conduction electrons against nonmagnetic impurities, ensuring the persistence of the proximity effect under realistic experimental conditions.

中文翻译：

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无杂散场的超导交变磁体存储功能

一类新型反铁磁体，称为交替磁体，表现出非相对论性的自旋分裂能带结构，让人想起序参量相位$d$波超导体，尽管没有净磁化强度。这种独特的特性使得能够在低温无杂散场存储器件中使用，从而提供实现高存储密度的可能性。我们在这里确定邻近的交流磁体如何影响临界温度${\mathrm{时间}}_C$传统的$s$-波单线态超导体。考虑双层和三层，我们表明这种混合结构可以用作无杂散场存储器件，其中临界温度通过旋转一个交变磁体的尼尔矢量来控制，从而提供无限磁阻。此外，我们的研究表明，交变磁力可以与超导共存，直至交变磁序的临界强度，以及交变磁力对传导电子对非磁性杂质的影响的鲁棒性，确保在实际实验条件下邻近效应的持续存在。