2012
DOI: 10.1063/1.3680084
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Planar Hall effect sensors with shape-induced effective single domain behavior

Abstract: We show that shape anisotropy induces effective single domain behavior in elliptical structures of thin permalloy films with long axis ranging between several microns to several millimeters, provided that the ratio of the film long and short axes is large enough. We also show that the thin film elliptical structures exhibit a wide range of effective anisotropy fields, from less than 10 Oe up to more than 100 Oe. We discuss the advantage of shape anisotropy in the fabrication of planar Hall effect sensors with … Show more

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Cited by 25 publications
(14 citation statements)
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“…At each angle, R x y is measured twice with a field and then after removing the field. The data confirm that as shown previously for a single ellipse, 11 when the applied magnetic field is set to zero, the magnetization fully returns to its orientation along the shape-induced easy axis. Figure 2 shows R x y as a function of H applied at α = 45 • .…”
Section: Device Manufacturing and Experimental Setupsupporting
confidence: 77%
See 1 more Smart Citation
“…At each angle, R x y is measured twice with a field and then after removing the field. The data confirm that as shown previously for a single ellipse, 11 when the applied magnetic field is set to zero, the magnetization fully returns to its orientation along the shape-induced easy axis. Figure 2 shows R x y as a function of H applied at α = 45 • .…”
Section: Device Manufacturing and Experimental Setupsupporting
confidence: 77%
“…PHE sensors based on elongated magnetic ellipses made of Permalloy exhibit shape-induced magnetic anisotropy along the long axis. [9][10][11][12] The ellipses are shown to have effective single magnetic domain behavior and in the limit of a ≫ b ≫ t the magnitude of the anisotropy field H k is reliably determined by where a, b and t are the ellipse's long axis, short axis, thickness, respectively, and M s is the saturation magnetization. As demonstrated before, these PHE sensors exhibit excellent magnetic field resolution.…”
Section: Introductionmentioning
confidence: 99%
“…8 However, a typical crossed-junction PHE sensor has low field sensitivity. Thus, there has been extensive research to increase sensitivity by optimizing sensor materials (i.e., exchange bias bilayer thin films, [9][10][11][12] spin valve thin films, 13,14 trilayer thin films, 15 and shape-induced anisotropy of a single ferromagnetic layer in an elliptically shaped element 16,17 ) and sensor architectures (i.e., tilted cross junction, 18 ring type, 19,20 and Wheatstone bridge type 21 ).…”
Section: Introductionmentioning
confidence: 99%
“…Although prepared on ultrathin polymeric foils, the sensitivity of these sensors meets the state of the art values reported for their rigid counterparts. [43][44][45] We showcase the performance of the sensor for two application examples in angle and proximity detection.…”
Section: Introductionmentioning
confidence: 99%