Correlation between crystal planes and disordering of ordered L10 FePt structure caused by ion irradiation

Hasegawa, Takashi; Yamazaki, Takafumi; Ishio, S.

doi:10.1016/j.matlet.2016.05.014

Cited by 4 publications

(4 citation statements)

References 16 publications

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“…Finally, we propose a nanopatterning method for this material system. According to our previous results, the ordered 1 0 structures of FePtX were easily transformed to the disordered 1 structure under ion irradiation [15][16][17][18][19][20][21]. Figure 5 shows the schematics of a nanopatterning method using an FM-PM phase change due to the 1 0 -1 structural transformation caused by ion irradiation.…”

Section: Resultsmentioning

confidence: 78%

“…[12][13][14], which leads to excellent thermal stability of magnetization in nanometer-size structures. After ion irradiation, the ordered 1 0 FePt films undergo transformation from the hard-FM phase (high ) to the soft-FM phase (low ) with the disordered 1 structure (fcc, = = ) [15][16][17][18][19][20]. Although the 1 0 FePt is suitable for BPM, modifying its properties using ion irradiation is difficult due to the insensitivity of magnetization with ion irradiation.…”

Section: Introductionmentioning

confidence: 99%

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Structural Dependent Ferromagnetic-Nonmagnetic Phase Change in FePtRu Films

Hasegawa

Ito

2017

Advances in Materials Science and Engineering

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Herein, we studied correlations between crystal structures and magnetic properties of FePt 1− Ru films. At room temperature, the chemical disordered 1 films with 0 ≤ < 0.20 and 0.20 ≤ ≤ 1.00 exhibited ferromagnetic properties and paramagnetic properties, respectively. Curie temperature of the disordered film with = 0.30 was 200 K. In contrast, the ordered 1 0 films had ferromagnetic properties in a wider range of 0 ≤ < 0.80 with the magnetic easy-axis perpendicular to the film plane. For 0 ≤ ≤ 0.50, with the ordered structure, the films had high magnetization and high uniaxial magnetic anisotropy of over 10 7 erg cm −3 . For = 0.60-0.70 with the ordered structure, a temperature-dependent magnetic phase transition appeared, and magnetization reached its maximum value at around 200 K. Using this material system, we proposed a nanopatterning method involving a ferromagnetic-paramagnetic phase change due to the ordered-disordered structural transformation.

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Section: Resultsmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Structural Dependent Ferromagnetic-Nonmagnetic Phase Change in FePtRu Films

Hasegawa

Ito

2017

Advances in Materials Science and Engineering

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“…The remanence in the IP direction was larger than that in the OOP direction in all the cases except the low energy 40 Ar + ion implanted sample. This suggests the change of easy axis from OOP direction to IP direction [116]. Moreover, except for the low energy 40 Ar + ion implanted sample, the coercivity in both directions has decreased a lot compared to the pristine sample, indicating that there might be a reduction in the anisotropy of the samples.…”

Section: Magnetic Hysteresis (M-h) Loop Measurementsmentioning

confidence: 94%

“…Around the same time, Liu et al reported that SOT from SHE in the Pt layer can switch the magnetization in the Co layer in Pt/Co PMA structures [116]. Slightly later, the same group studied the Pt/Co/AlOx structure and demonstrated magnetization switching because of SHE in the Pt underlayer [117].…”

Section: )mentioning

confidence: 99%