Direct imaging of cross-sectional magnetization reversal in an exchange-biased CoFeB/IrMn bilayer

Galvanic Replacement Reaction Involving Core–Shell Magnetic Chains and Orientation‐Tunable Microwave Absorption Properties

“…[25,53] Similarly, micro-scale magnetic chains (CoNi, Cu@Ni, Cu@Co) implied magnetic vortices movement because of the identical magnetic property under applied high-frequency microwave field. Discussing related magnetic responding behaviors directly, off-axis electron holograms, which can be used to distinguish the phase movement of an electron wave in its travel pathway, [68] were conducted, as depicted in Figure 7g-i. When irradiated by the alternating EM fields, a mutual coupling interaction between the adjacent magnetic particles occurs, which can significantly dissipate the microwave energy.…”

Interfacial Ferromagnetic Coupling and Positive Spontaneous Exchange Bias in SrFeO3–x/La0.7Sr0.3MnO3 Bilayers

“…Since the discovery of exchange bias (EB) by Meiklejohn and Bean in 1956, it has gained enormous interest for its complicated fundamental and promising applications in spin valves, magnetic recording read heads, giant magnetoresistive sensors, etc. − Generally, EB phenomena are observed in ferromagnetic/antiferromagnetic (FM/AFM) heterostructures when the system is cooled down in an external magnetic field below the T N of the AFM phase. It is found that negative exchange bias (NEB), namely the shift of the magnetization–magnetic field ( M – H ) curve opposite to the field-cooling (FC) direction, is very common. − However, positive exchange bias (PEB), which is the shift of the M – H curve along the FC direction, is rare, and was first observed in FeF 2 /Fe bilayers by Nogués .…”

Hierarchically Engineered Manganite Thin Films with a Wide-Temperature-Range Colossal Magnetoresistance Response

“…Strain in the LSMO structure might affect the Mn-e g electronic distribution or cause octahedral rotations that change the Mn–O–Mn bond lengths and angles, which then will alter magnetic properties, e.g., the FM-PM transition temperature ( T c ). , In order to explore the local magnetic property inside the hierarchical LSMO film with spatially nonuniform strain distribution, we employed off-axis electron holography (EH). , EH is an interferometric TEM method, which allows reconstructing the phase shift of the beam electron wave transmitted through the specimen with a spatial resolution of a few nanometers under external magnetic field free conditions in the so-called Lorentz mode. , Figure shows the phase images within the hierarchical film when the temperature is raised from 94 to 330 K. The details of the EH measurements and analysis are provided in Experimental Methods and Figures S4 and S6 in the Supporting Information. It is important to note that both magnetic induction and mean inner potential (MIP) of the specimen contribute to the phase shift of the electron beam.…”

“…45,46 EH is an interferometric TEM method, which allows reconstructing the phase shift of the beam electron wave transmitted through the specimen with a spatial resolution of a few nanometers under external magnetic field free conditions in the so-called Lorentz mode. 47,48 Figure 4 shows the phase images within the Here, we have separately determined the electrostatic MIP contribution by recording a phase image of the same area at 350 K, at which the specimen is in a completely nonmagnetic (paramagnetic) state (this nonmagnetic state is discussed further later in the paper). In the phase images presented in Figure 4a−h, the electrostatic contribution φ el (x,y) to the phase image is displayed as grayscale depicting the projected morphology, whereas the magnetostatic contribution φ mag (x,y) is superimposed as red isolines.…”