Growth-induced non-planar magnetic anisotropy in FeCoZr-CaF2 nanogranular films: Structural and magnetic characterization

Kasiuk, J.; Fedotova, Julia; Przewoźnik, J.; Żukrowski, J.; Sikora, Marcin; Kapusta, Cz.; Grce, Ana; Milosavljević, M.

doi:10.1063/1.4891016

Cited by 23 publications

(12 citation statements)

References 37 publications

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“…This result is also confirmed by XRD data presented in Fig. 2 and described in details in [26,27]. Both XRD and electron diffraction reveal that nanoparticles are characterized by bcc structure of FeCo alloy which is labeled as aFeCo(Zr) [9,26,28].…”

Section: Methodssupporting

confidence: 76%

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Inductive type properties of FeCoZr–CaF2 and FeCoZr–PZT nanocomposites

Kołtunowicz

2015

J Mater Sci: Mater Electron

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The paper presents investigations into frequency dependences of conductivity, capacitance and the phase angle h for nanocomposites (FeCoZr) x (CaF 2 ) (100-x) and (FeCoZr) x (PZT) (100-x) . The nanocomposites have been produced with the application of ion-beam sputtering using pure argon ions (oxygen-free materials) and mixed ions of argon and oxygen (oxygen materials). The phase angle versus frequency characteristics for the oxygen nanocomposites show a transition from negative to positive phase angle values along with the frequency increase. The maximum observed phase angle h values reach beyond the 90°. The phase angle transition through 0°is accompanied with the voltage resonance phenomenon that is represented by strong minima in the capacitance versus frequency curves. In the conductivity versus frequency characteristics, strong minima occur during the phase angle h transition through 90°, which corresponds to the occurrence of current resonance. Occurrence of the coilless inductance features in nanocomposites (FeCoZr) x (PZT) (100-x) and (FeCoZr) x (CaF 2 ) (100-x) , produced with the ion-beam sputtering using argon and oxygen ions, is related to the formation of a subsurface layer of metal oxides on the metallic phase nanogranules.

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Section: Methodssupporting

confidence: 76%

“…As was previously shown in [9,26], (FeCoZr) x (CaF 2 ) (100-x) nanocomposites are of a granular structure with an average size of the ferromagnetic alloy grain of about 3-5 nm. Corresponding TEM images are presented in Fig.…”

Section: Methodsmentioning

confidence: 72%

Inductive type properties of FeCoZr–CaF2 and FeCoZr–PZT nanocomposites

Kołtunowicz

2015

J Mater Sci: Mater Electron

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“…Possible contributions from a small quantity of zirconium oxide to addi-tionally stabilize the oxide shells cannot be excluded, as it is proved by EXAFS and reported in Ref. 34.…”

Section: Resultsmentioning

confidence: 98%

“…In the absence of the (Fe x Co 1Àx ) 1Àd O phase, which was not detected in these strongly oxidized films, the superparamagnetic state of oxide nanoparticles is stabilized at x > x c , which may be caused by precipitation of the zirconium oxide formed at the nanoparticle/matrix interface. 34 Thus, it is believed that PbZrTiO 3 is a more friable matrix than alumina, as it does not assist in the conservation of the nonoxidized metallic cores in the nanoparticles during both the deposition and annealing procedures.…”

Section: Resultsmentioning

confidence: 99%

AC Hopping Conductance in Nanocomposite Films with Ferromagnetic Alloy Nanoparticles in a PbZrTiO3 Matrix

Kołtunowicz

Żukowski

Boiko

et al. 2015

Journal of Elec Materi

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In this work, the temperature and frequency dependences of the real part of the admittance [r(f, T)] of annealed nanocomposite films containing Co 45 Fe 45 Zr 10 -based nanoparticles covered with native oxides and embedded in a doped PbZrTiO 3 ferroelectric matrix were studied. The nanocomposites studied were deposited by ion sputtering a complex target in a mixed Ar/O 2 atmosphere followed by a 15-min annealing process (with steps of 25 K) in air in the temperature range of 398 K £ T a £ 573 K. The r(f, T) of the annealed samples was measured in the temperature range of 77 K < T p < 373 K at frequencies of 50 Hz < f < 1 MHz. The observed r(f, T) dependences confirmed that the annealed samples displayed the effects of negative capacitance over the whole frequency and temperature ranges studied because of the pronounced oxidation of the nanoparticles. The r(f, T) dependences obtained are described using an earlier-developed AC hopping conductance model. Comparisons between experimental and simulation results allow the model parameters to be estimated, such as the activation energies of the hopping conductance and the lifetimes of the electrons in the nanoparticles.

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“…17 This kind of magnetic anisotropy is an unusual phenomenon for granular nanostructures and has only been reported in a few granular systems such as Co-ZrO films 8 and FeCoZr-CaF 2 films. 19 In contrast, the Co(4)/HfN(1.5) multilayers possess soft magnetic properties and show absence of stripes domain as observed in the left inset, indicating that the PMA has been suppressed because of the interlayer separation. By systematically varying the Co and HfN layer thicknesses, the magnetization curves (M-H curves) of Co(x)/HfN(1.5) multilayers with different Co layer thicknesses were determined, as shown in Fig.…”

Section: A Effect Of Co Layer and Hfn Interlayer Thickness On The Mamentioning

confidence: 94%

Magnetic properties and thermal stability of Co/HfN multilayer films for high-frequency application

et al. 2017

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Sputtered metal–nonmetal granular films tend to exhibit growth-induced perpendicular magnetic anisotropy. In this work, Co/HfN multilayers were synthesized to suppress the development of columnar clusters along the deposition direction. The results reveal that a HfN interlayer thickness of less than 0.4 nm is insufficient to separate the columnar clusters; however, increasing the interlayer thickness to 0.8 nm with increasing the sputtering duration successfully led to typical in-plane magnetic anisotropy with a coercivity as low as 3 Oe. The Co(4 nm)/HfN(1.5 nm) multilayers exhibited high permeability of approximately 260 up to 1.6 GHz. The resonance frequency increased from 1.8 to 2.3 GHz with increasing annealing temperature, which is attributed to the increased magnetic anisotropy. Our results suggest that the multilayers still show high-frequency performance even after annealing at 450 °C, which would be a big advantage for complementary metal–oxide–semiconductor (CMOS) fabrication technology.

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Growth-induced non-planar magnetic anisotropy in FeCoZr-CaF2 nanogranular films: Structural and magnetic characterization

Cited by 23 publications

References 37 publications

Inductive type properties of FeCoZr–CaF2 and FeCoZr–PZT nanocomposites

Inductive type properties of FeCoZr–CaF2 and FeCoZr–PZT nanocomposites

AC Hopping Conductance in Nanocomposite Films with Ferromagnetic Alloy Nanoparticles in a PbZrTiO3 Matrix

Magnetic properties and thermal stability of Co/HfN multilayer films for high-frequency application

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