FeNi-based magnetoimpedance multilayers: Tailoring of the softness by magnetic spacers

The microstructure and magnetic properties of sputtered permalloy films and FeNi(170 nm)/X/FeNi(170 nm) (X = Co, Fe, Gd, Gd-Co) sandwiches were studied. Laminating of the thick FeNi film with various spacers was done in order to control the magnetic softness of FeNi-based multilayers. In contrast to the Co and Fe spacers, Gd and Gd-Co magnetic spacers improved the softness of the FeNi/X/FeNi sandwiches. The magnetoimpedance responses were measured for [FeNi/Ti(6 nm)]2/FeNi and [FeNi/Gd(2 nm)]2/FeNi multilayers in a frequency range of 1–500 MHz: for all frequencies under consideration the highest magnetoimpedance variation was observed for [FeNi/Gd(2 nm)]2/FeNi multilayers.

[1]  Galina V. Kurlyandskaya,et al.  Domain structure and magnetization process of a giant magnetoimpedance geometry FeNi/Cu/FeNi(Cu)FeNi/Cu/FeNi sensitive element , 2004 .

[2]  W. Xu,et al.  Tuning the permeability of permalloy films for on-chip inductor applications , 2010 .

[3]  A. Garcia-Arribas,et al.  Structure and Magnetic Properties of Thin Permalloy Films Near the “Transcritical” State , 2010, IEEE Transactions on Magnetics.

[4]  J. Prieto,et al.  Magnetoresistance in a constricted domain wall. , 2003, Physical review letters.

[5]  J. Bonevich,et al.  400-fold reduction in saturation field by interlayering , 2009 .

[6]  E. Feldtkeller.  Coupled Walls in Multilayer Films , 1968 .

[7]  A. Vaurès,et al.  Evidence for a self-organized growth in granular Co/Al2O3 multilayers , 2000 .

[8]  David Babonneau,et al.  Spontaneous organization of columnar nanoparticles in Fe-BN nanocomposite films , 2005 .

[9]  D. Ciudad,et al.  Magnetic properties of sputtered Permalloy/molybdenum multilayers , 2011 .

[10]  K. Heinz,et al.  The structure of thin epitaxial Fe films on Cu(100) in the transition range fcc→bcc , 1994 .

[11]  J.M. Barandiaran,et al.  Longitudinal and Transverse Magnetoimpedance in FeNi/Cu/FeNi Multilayers With Longitudinal and Transverse Anisotropy , 2008, IEEE Transactions on Magnetics.

[12]  M. Farle,et al.  Thickness-dependent Curie temperature of Gd(0001)/W(110) and its dependence on the growth conditions. , 1993, Physical review. B, Condensed matter.

[13]  C. Chien,et al.  Magneto-impedance effects in multilayered permalloy materials , 1999 .

[14]  Alfredo García-Arribas,et al.  FeNi-based magnetic layered nanostructures: Magnetic properties and giant magnetoimpedance , 2010 .

[15]  A. V. Gorbunov,et al.  Peculiarities of ferrimagnetism of Gd/Co multilayers , 2001 .

[16]  H. Hoffmann,et al.  Theory of magnetization ripple , 1968 .

[17]  Yutaka Sugita,et al.  CRITICAL THICKNESS AND PERPENDICULAR ANISOTROPY OF EVAPORATED PERMALLOY FILMS WITH STRIPE DOMAINS , 1967 .

[18]  Zhang,et al.  Structure of Co films grown on Cu(111) studied by photoelectron diffraction. , 1993, Physical review. B, Condensed matter.

[19]  A. Butera,et al.  Stripe domains in Permalloy films as observed by ferromagnetic resonance and magnetic force microscopy , 2009 .

[20]  S. Bader,et al.  Enhanced interfacial magnetic coupling of Gd /Fe multilayers. , 2001, Physical review letters.

[21]  D. Litvinov,et al.  Magnetic force microscopy study of magnetic stripe domains in sputter deposited Permalloy thin films , 2008 .

[22]  M. Labrune,et al.  Thickness-dependent magnetic excitations in Permalloy films with nonuniform magnetization , 2004 .

[23]  Galina V. Kurlyandskaya,et al.  Modification of the “Transcritical” state in Ni75Fe16Cu5Mo4 films produced by RF sputtering , 2004 .

[24]  V. N. Lepalovskii,et al.  Multilevel interaction between layers in layered film structures , 1997 .

[25]  P. Lubitz,et al.  Effects of spacer layer on growth, stress and magnetic properties of sputtered permalloy film , 2004 .

[26]  P. Tiberto,et al.  Stripe domains and spin reorientation transition in Fe78B13Si9 thin films produced by rf sputtering , 2008 .