Laser ablated pure non-crystalline Co thin films for inductors for ultra-high frequencies

Abstract

Non-crystalline Co thin films have been prepared by pulsed laser ablation deposition. From

Magnetic domain structures and nano-string morphology of laser off-normal deposited amorphous cobalt films with controlled magnetic anisotropy

“…Also the magnetic domain pictures-sharpness zigzag charged walls for high magnetic anisotropic films and big zigzag Bloch walls for films with low anisotropy-are presented. rThe Pulsed Laser Deposition, PLD, technique allows one to produce amorphous films [1], in our case soft magnetic Co ones [2]. For sputtered Co films the induction of controlled magnetic anisotropy by offnormal deposition technique has been investigated [3, 4], attributing its origin to the shape effect produced by the ''self-shadowing'' growing of the films.…”

Ultrahigh frequency magnetic susceptibility of Co and Fe cylindrical films deposited by pulsed laser ablation

“…[8][9][10][11] Losses in the coaxial waveguide, less than 0.1 dB at 6 GHz, were considerably smaller than those measured in planar waveguides ͑strip loop͒ used to measure planar deposits. 12 Previous results on samples with a cylindrical geometry have also been reported in the literature. These reports detailed the magnetic properties of soft magnetic wires ͑with typical diameters of 125 m͒ and microwires ͑with typical diameters of 8 m͒, mainly focusing on the giant magnetoimpedance ͑GMI͒ effect they measured.…”

“…The coercivity was 1 Oe. In addition, in the asdeposited state, the room-temperature resistivity was 100 ⍀ cm, which was one order of magnitude larger than the value measured in bulk crystalline Co. 12,19 Deposition of the Co films at an oblique angle of incidence allowed observation of an easy magnetization direction perpendicular to the incidence plane. The anisotropy field could be changed from 10 to 700 Oe by changing the deposition angle.…”

Studies of the magnetoelastic inverse Wiedemann effect in pulsed laser deposited cylindrical cobalt films

“…The pulsed laser deposition technique, PLD, has been successfully applied to the fabrication of thin films, including magnetic and magnetoelastic films [1][2][3][4][5][6][7][8][9][10][11][12]. A clear understanding of the principles governing the behaviour of these films is of fundamental as well as technological importance.…”

“…When a helical magnetic anisotropy, K h , exists in the magnetostrictive PLD Co-i.e., a torque is applied to the wire-and a circular magnetic field H φ -created by an AC electrical current-is applied, an AC voltage can be measured; this voltage being proportional to dφ z /dt. of single ferromagnetic elements is possible under certain experimental conditions [4,[7][8][9][11][12][13][14][15][16]. For example, Hiroshima et al [4] reported results on the amorphous structure of PLD Co films.…”