Giant magnetoresistance in nonmultilayer magnetic systems

Correlations of crystallographic defects and anisotropy with magnetotransport properties inFexTaS2single crystals (0.23≤x≤0.35)

“…More remarkable is that the maximum in all these values appears at some intermediate composition between the two superstructures at x = 1/4 and 1/3. The ∆M/M s correlation with MR was also observed in 2D and 3D ferromagnetic systems, such as Ni 81 Fe 19 layers separated by non-magnetic Cu layer, 14 and ferromagnetically inhomogeneous Cu-Co alloys, 15,17 and was attributed to the misalignment of the spins. 14,15,17 There are also substantive differences between Fe x TaS 2 and other magnetic systems mentioned previously, 14,15,17 most significantly that the magnetic moments in Fe x TaS 2 flip along the c axis at H s instead of tilting off the c axis.…”

“…14,15 Although GMR was predominantly observed in two dimensional systems due to the increased interfacial scattering where the misalignment occurred, the same physics could take place in some 3D systems where ferromagnetic clusters were immersed in a non-magnetic matrix. 15,17 The GMR in both 2D and 3D systems indicates that the misalignment of magnetic moments is crucial to produce a large magnetoresistance. 14,15,17 Meanwhile, materials that have large MR are still rare and in demand.…”

“…15,17 The GMR in both 2D and 3D systems indicates that the misalignment of magnetic moments is crucial to produce a large magnetoresistance. 14,15,17 Meanwhile, materials that have large MR are still rare and in demand. To search for new materials that have large MR, beyond 2D heterostructures, ferromagnetic materials that can easily have misalignments of the magnetic moments are preferred.…”

Very large magnetoresistance in electrodeposited single-crystal Bi thin films (invited)

“…Even though the magnitude is relatively small ͑2%͒, the AMR effect in permalloy has already been extensively used in MR read heads and sensors for low magnetic fields. The discovery in 1988 of giant MR ͑GMR͒ in antiferromagnetically coupled magnetic multilayers ͑e.g., Co/Cu͒, 2,3 and subsequently in other geometries such as granular systems ͑e.g., Co particles in a Cu matrix͒, 4,5 has attracted worldwide attention. The term GMR now refers to MR effects due to spin-dependent scattering, which can be ''giant'' ͑as much as 150% in ideal cases͒ 6 or small ͑of order 10% in most cases͒.…”

Local conductance spectra of itinerant ferromagnetic SrRuO3 through break junction

“…24) Here, we regard the junction as a type of giant magnetoresistance (GMR) device. [25][26][27] GMR is ascribed to spin-dependent electrical transport phenomena that show low (high) resistance between the parallel (antiparallel) spin configurations of ferromagnetic devices.…”