A Generic Sacrificial Layer for Wide‐Range Freestanding Oxides with Modulated Magnetic Anisotropy

Abstract

Freestanding oxide nanomembranes have promising applications because of their novel electronic states and flexible crystalline structures. Several materials have been developed as sacrificial layers to exfoliate thin films from substrates via wet-etching. However, these materials face great challenges in terms of either complicated crystalline structures or corrosive solutions. Here, a new sacrificial material, SrCoO 2.5 , is presented, which can be coherently grown with wide-range strains and crystalline orientations and is also soluble in eco-friendly solutions such as acetic acid, vinegar, and even carbonated drinks. With SrCoO 2.5 as the sacrificial layer, high-quality freestanding ferromagnetic SrRuO 3 membranes are achieved from wide-range epitaxial strains and different crystalline orientations. By investigating the evolution of the magnetic properties of these samples, it is discovered that epitaxial strain causes a distinct modification of the magnetic anisotropy of (001) pc -oriented SrRuO 3 samples, while its influence on the (110) pc and (111) pc samples is insignificant. This study not only demonstrates the freestanding SrRuO 3 as a promising material for flexible spintronic devices, but also offers a great opportunity to engineer a wide range of strained and oriented complex oxides for novel freestanding electronics using this newly developed sacrificial material.

Freestanding Perovskite Oxide Films: Synthesis, Challenges, and Properties

“…Recently, SrCoO 2.5 (SCO) has been also proposed as generic sacrificial layer for a facile epitaxy of perovskite oxides thin films. [76] SCO presents a brownmillerite structure with an inplane lattice parameter close to the STO (a = 3.90 Å) and can be epitaxially grown on many perovskite substrates with different crystallographic orientations. Moreover, SCO can be dissolved in weak acetic acid solutions, in vinegar and in common carbonated drinks, which allows a safe transfer process of perovskite membranes.…”

Research progress of applications of freestanding single crystal oxide thin film

“…图 1 自支撑单晶氧化物薄膜的剥离制备工艺及应用：制备工艺包括机械剥离 [17,24] 和湿法牺 牲层剥离 [25] ，应用方向包括铁电存储 [26] 、能量收集 [19] 、介电储能 [27] 、超导 [28] 、磁性氧化物 [29,30] 和新应用方向 [17,31] Fig. 1.…”

“…1. Preparation methods and applications of freestanding single crystal oxide films: synthesis methods include wet etching technology [25] and mechanical exfoliation [17,24] , while applications include ferroelectric memory [26] , piezoelectric energy harvester [19] , dielectric energy storage [27] , correlated oxide interface [28] , magnetic oxide device [29,30] and novel freestanding oxide structure [17,31] .…”

Refreshment of SrTiO3 Substrate for Layer Peeling‐off using Sacrificial Sr3Al2O6

“…The freestanding complex oxides open a door to additional spectrums of 2D materials with exotic correlated electronic phases. Based on the excellent stretchability of freestanding oxide membranes and strong correlation between quantum properties and lattice constant, the functional properties of oxide can be comparable and even superior to those in their bulk or rigid thin film forms, such as enhanced and controllable ferromagnetism, [1][2][3] monolayer and super-elastic ferroelectricity, [4,5] and topological ferroelectric domains. [6] Most recently, the freestanding complex oxides were also demonstrated to integrate www.advmatinterfaces.de peaks are located on the left and right side of (002)STO peak, consistent with the previous study.…”