Charge Transfer Control of Emergent Magnetism at SrMnO ₃ /LaMnO ₃ Interfaces

Emergent phases at the interfaces in strongly correlated oxide heterostructures display novel properties not akin to those of constituting materials. The interfacial ferromagnetism (LaMnO3)m/(SrMnO3)n (LMO)m/(SMO)n superlattices (SLs) with antiferromagnetic bulk LMO and SMO layers is believed be a result charge transfer (CT). By using situ optical ellipsometry, it demonstrated directly that CT emergent magnetism SLs are controlled by LMO/SMO thickness ratio, chosen as m/n = 1 2. enhanced 2 favors high-TC TC 350–360 K, whereas reduced suppresses yielding 300 K. A complex dependence saturation magnetization function interface density Λ (m + n)−1 minima 0.11 (m/n 2) 0.25 1) was observed rationalized competition ferromagnetic contributions, originating from volume well interfaces. role epitaxy stress MnO6 octahedral tilts magnetic behavior discussed.