Permalloy thin-film magnetic sensors

Bi-Directional Giant Magneto Impedance Sensor

A thin film giant magneto impedance (GMI) based on magnetic field sensor has been developed using electrodeposited Ni-Fe permalloy. Chemical composition, surface morphology, and magnetic properties of Ni-Fe permalloy were characterized as a function of plateup parameters, and process conditions were established to deposit a Ni-Fe thin film with a high permeability (~1000) and a low coercivity (...

Permalloy-Based Thin Film Structures: Magnetic Properties and the Giant Magnetoimpedance Effect in the Temperature Range Important for Biomedical Applications

Permalloy-based thin film structures are excellent materials for sensor applications. Temperature dependencies of the magnetic properties and giant magneto-impedance (GMI) were studied for Fe19Ni81-based multilayered structures obtained by the ion-plasma sputtering technique. Selected temperature interval of 25 °C to 50 °C corresponds to the temperature range of functionality of many devices, i...

Observation of magnetization reversal of thin-film permalloy nanostructures using ballistic electron magnetic microscopy

We have imaged the magnetization reversal process of thin-film permalloy (Ni80Fe20) nanostructures using ballistic electron magnetic microscopy. Their switching behavior is often influenced by the formation of end domains and the subsequent domain-wall propagation under application of a magnetic field. Occasionally, this process leads to the formation of a 360° domain wall that is stable in fie...

Development of Surface Micromachined Magnetic Actuators Using Electroplated Permalloy

Results on design, fabrication and testing of silicon micromachined magnetic actuators are presented. Magnetic actuators are capable of providing large force (on the order of mN) and large displacement (micrometer to millimeter range) within micro electromechanical devices and systems. Electroplated Permalloy (Ni80Fe20) material is the media for magnetic interaction and force generation. The Pe...

The Magnetic and Electrical Properties of Permalloy-Carbon Thin Film Multilayers

Ultrafast precessional switching in a permalloy thin film with magnetic surface anisotropy.

Analytical and numerical analysis of ultrafast precessional switching dynamics, in a uniformly magnetized anisotropic permalloy thin film, described by the Landau-Lifshitz (LL) equation is presented. Precessional switching is realized in the film by applying a uniform pulsed magnetic field normal to the easy axis of magnetocrystalline anisotropy. The analytical solution of the LL equation is ex...