Tuning of ferrimagnetism and perpendicular magnetic anisotropy in 
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 epitaxial films by the cation distribution

Shen, Y.F.; Kan, Daisuke; Tan, Zhenhong; Wakabayashi, Yusuke; Shimakawa, Yuichi

doi:10.1103/physrevb.101.094412

Cited by 42 publications

(41 citation statements)

References 34 publications

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“…τ m of ∼ 0.4 ps is much shorter than that of other half-metallic oxides (τ m > 100 ps). Considering the metallicity based on the X-ray photoemission spectroscopy (XPS) measurement, this result implies that the spin polarization |P | of the NCO film is ∼0.7, lower than the value expected from theoretically predicted half-metallic band structure [28].…”

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confidence: 72%

“…For NCO epitaxial films developed by pulsed laser deposition, the T d -site Co is partially replaced with the O h -site Ni, influencing magnetic and transport properties. By depositing NCO at relatively high oxygen pressure (e.g., 100 mTorr), they have been shown to produce epitaxial films whose cation occupation is close to the stoichiometric [27,28].…”

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confidence: 99%

“…The NCO samples are described in Refs. [27,28]. First, we have measured the field-dependent magnetic domain for NCO thin films based on MOKE microscopy using white LED as a light source with Köhler illumination method.…”

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confidence: 99%

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Ultrafast demagnetization in NiCo2O4 thin films probed by time-resolved microscopy

Takahashi,

Tani,

Abe

et al. 2021

Preprint

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Using a time-resolved magneto-optical Kerr effect (TR-MOKE) microscope, we observed ultrafast demagnetization of inverse-spinel-type NiCo2O4 (NCO) epitaxial thin films of the inverse spinel type ferrimagnet NCO with perpendicular magnetic anisotropy. This microscope uses a pump-probe method, where the sample is pumped at 1030 nm, and magnetic domain images are acquired via MOKE microscopy at 515 nm (the second harmonic). We successfully observed the dynamics of the magnetic domain of the NCO thin film via laser irradiation, and obtained a demagnetization time constant of approximately 0.4 ps. This time constant was significantly smaller than the large time constants reported for other half-metallic oxides. These results, combined with the results of our x-ray photoemission spectroscopy study, indicate that this NCO thin film is a ferrimagnetic metal whose electronic structure deviates from the theoretically predicted half-metallic one.

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confidence: 72%

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confidence: 99%

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Ultrafast demagnetization in NiCo2O4 thin films probed by time-resolved microscopy

Takahashi,

Tani,

Abe

et al. 2021

Preprint

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“…It has been shown that when NCO films are epitaxially grown by pulsed laser deposition, depositing NCO under relatively high oxygen pressures like 100mTorr is a key for fabricating films having properties comparable to bulk 20,22,23 for example, a large saturation magnetization of ~2µB/f.u. and a high transition temperature above 400 K. Resonant x-ray diffraction measurements have recently shown that cation occupation in such high-quality NCO films still deviates from the stoichiometric occupation: about 15% Co in the Td-site is replaced by Ni while Co and Ni almost equally occupy the Oh site 22 . It should also be pointed out that Td-site cations play key roles in magnetizations and perpendicular magnetic anisotropy of NCO epitaxial films 20,24,25 .…”

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confidence: 99%

“…Hereafter these two films are referred to as the high-rate film and the low-rate film. We have previously shown that NCO films grown under the same conditions as those used for growing the low-rate film have a large room-temperature magnetization (~1 µB/f.u) and sufficient perpendicular magnetic anisotropy (~0.2 MJ/m 3 in the magnetic anisotropy energy at room temperature) 13,22 . Figure 1a shows x-ray 2θ/θ diffraction patterns around the (004) MAO reflection for the high-rate film and the low-rate film.…”

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Influence of deposition rate on magnetic properties of inverse-spinel NiCo₂O₄ epitaxial thin films grown by pulsed laser deposition

Kan

Suzuki

Shimakawa

2020

Jpn. J. Appl. Phys.

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We investigated the influence of the deposition rate on structural and magnetic properties of inverse-spinel ferrimagnet NiCo2O4 epitaxial films grown by pulsed laser deposition. While films' lattice constants are insensitive to the deposition rate, saturation magnetization and perpendicular magnetic anisotropy for the film grown with a high deposition rate are reduced. These results imply that growing NiCo2O4 films with a high deposition rate leads to occupations of the tetrahedral site by Ni, although Ni ideally occupies only the octahedral site. Controlling the deposition rate and modulating the cation distribution is key for tuning the magnetic properties in NiCo2O4 films.

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Underlying Mechanisms and Tunability of the Anomalous Hall Effect in NiCo₂O₄ Films with Robust Perpendicular Magnetic Anisotropy

Lv,

Huang,

Zhang

et al. 2023

Advanced Science

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Their high tunability of electronic and magnetic properties makes transition‐metal oxides (TMOs) highly intriguing for fundamental studies and promising for a wide range of applications. TMOs with strong ferrimagnetism provide new platforms for tailoring the anomalous Hall effect (AHE) beyond conventional concepts based on ferromagnets, and particularly TMOs with perpendicular magnetic anisotropy (PMA) are of prime importance for today's spintronics. This study reports on transport phenomena and magnetic characteristics of the ferrimagnetic TMO NiCo2O4 (NCO) exhibiting PMA. The entire electrical and magnetic properties of NCO films are strongly correlated with their conductivities governed by the cation valence states. The AHE exhibits an unusual sign reversal resulting from a competition between intrinsic and extrinsic mechanisms depending on the conductivity, which can be tuned by the synthesis conditions independent of the film thickness. Importantly, skew‐scattering is identified as an AHE contribution for the first time in the low‐conductivity regime. Application wise, the robust PMA without thickness limitation constitutes a major advantage compared to conventional PMA materials utilized in today's spintronics. The great potential for applications is exemplified by two proposed novel device designs consisting only of NCO films that open a new route for future spintronics, such as ferrimagnetic high‐density memories.

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Tuning of ferrimagnetism and perpendicular magnetic anisotropy in NiCo2O4 epitaxial films by the cation distribution

Cited by 42 publications

References 34 publications

Ultrafast demagnetization in NiCo2O4 thin films probed by time-resolved microscopy

Ultrafast demagnetization in NiCo2O4 thin films probed by time-resolved microscopy

Influence of deposition rate on magnetic properties of inverse-spinel NiCo₂O₄ epitaxial thin films grown by pulsed laser deposition

Underlying Mechanisms and Tunability of the Anomalous Hall Effect in NiCo₂O₄ Films with Robust Perpendicular Magnetic Anisotropy

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Tuning of ferrimagnetism and perpendicular magnetic anisotropy in NiCo2O4 epitaxial films by the cation distribution

Cited by 42 publications

References 34 publications

Ultrafast demagnetization in NiCo2O4 thin films probed by time-resolved microscopy

Ultrafast demagnetization in NiCo2O4 thin films probed by time-resolved microscopy

Influence of deposition rate on magnetic properties of inverse-spinel NiCo2O4 epitaxial thin films grown by pulsed laser deposition

Underlying Mechanisms and Tunability of the Anomalous Hall Effect in NiCo2O4 Films with Robust Perpendicular Magnetic Anisotropy

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Influence of deposition rate on magnetic properties of inverse-spinel NiCo₂O₄ epitaxial thin films grown by pulsed laser deposition

Underlying Mechanisms and Tunability of the Anomalous Hall Effect in NiCo₂O₄ Films with Robust Perpendicular Magnetic Anisotropy