Temperature-dependent periodicity halving of the in-plane angular magnetoresistance in La0.67Sr0.33MnO3 thin films on LaAlO3

Abstract

Strain-engineering is used as a tool to alter electronic and magnetic properties like anisotropy energy. This study reports the different angledependent magnetoresistance properties of the strain-engineered La 0.67 Sr 0.33 MnO 3 (LSMO) thin films, grown on LaAlO 3 , compared to their bulk analogs. Upon increasing temperature, a symmetry change from fourfold [cos(4h)] to twofold [cos(2h)] is observed in the angledependent resistance measurements. This systematic study with increasing temperature allows us to define three distinct temperaturedependent phases. The fourfold symmetric signal originates from magnetocrystalline anisotropy, whereas the twofold symmetric signal is believed to be the conventional anisotropic magnetoresistance. Our observations show that strain-engineering creates the possibility to manipulate the anisotropy, which, for example, can ultimately lead to observations of noncollinear quasi-particles like skyrmions in single layer thin films of LSMO.

Strain-driven antiferromagnetic exchange interaction in SrMnO3 probed by phase-shifted spin Hall magnetoresistance

“…The gradual phase shift observed in all rotational directions is remarkable and suggests a modulation of the effective magnetic anisotropy with increasing temperature. Suppression of specific anisotropy axes may arise due to possible temperature-dependent structural properties such as polar order or strain similar to that reported in strained manganites such as La 0.67 Sr 0 .67MnO 3 , where a strong temperature dependence of the magnetocrystalline anisotropy is observed [43,44].…”

Significant Reduction of the Dead Layers by the Strain Release in La0.7Sr0.3MnO3 Heterostructures

“…Meanwhile, due to the compressive strain from the substrates, perpendicular magnetic anisotropy was also observed in the deposited LSMO films . The magnitude of magnetic anisotropy could be manipulated by the out-of-plane strain . However, when the thickness of the ultrathin LSMO films decreases below a critical value, the appealing ferromagnetic and metallic features would vanish.…”

“…20 The magnitude of magnetic anisotropy could be manipulated by the out-of-plane strain. 22 However, when the thickness of the ultrathin LSMO films decreases below a critical value, the appealing ferromagnetic and metallic features would vanish. Such a critical thickness is called the dead layer of LSMO.…”

Morphology control of volatile resistive switching in La0.67Sr0.33MnO3 thin films on LaAlO3 (001)

“…Thin films of LSMO are metallic ferromagnets below their T C of approximately 370 K and undergo transition to insulating paramagnets above this temperature. In our earlier works (Burema et al, 2019;Burema and Banerjee, 2021), we have demonstrated that compressively strained thin films of La 0.7 Sr 0.3 MnO 3 on a LaAlO 3 substrate with twin domains lead to the coexistence of different magnetically ordered phases, as revealed from magnetization and electronic transport measurements. This was ascribed to the straininduced Jahn-Teller distortion that favors d 3z2−r2 orbitals over d x2−y2 orbitals at such compressively strained interfaces.…”