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Magnetic frustration in ferromagnetic metallic systems is unusual due to thelong-range and symmetric nature of the exchange interactions. In this work weprove that it is possible to obtain a highly frustrated ferromagnetic phase ina multi-sublattices cubic structure through a fine tuning of the magneticinteractions. This peculiar state is achieved in Ni-Mn-(In, Sn) Heusler alloysand results in the effective decoupling of their two intertwined ferromagneticsublattices. One sublattice is ferromagnetic long range ordered below themacroscopic Curie temperature (TC ) whereas the second one remains disordereduntil a crossover to a polarized state occurs at T << TC . This result pointsout that a fine engineering of the magnetic interactions in metallic systemscan lead to interesting novel and emergent phenomena.

Effective decoupling of ferromagnetic sublattices by frustration in Heusler alloys