Structure and magnetic properties of L10 FePt film with Ag heat sink layer

2009 ◽  
Vol 105 (7) ◽  
pp. 07B724 ◽  
Author(s):  
J. S. Chen ◽  
J. F. Hu ◽  
B. C. Lim ◽  
W. L. Phyoe ◽  
B. Liu ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Heat Sink ◽  
Fept Film

Microstructure and magnetic properties of FePt film with combined MoC/(Mg–X)O (X=Cu, Ni, Co) intermediate layers

2017 ◽  
Vol 422 ◽  
pp. 262-270 ◽  
Author(s):  
Jai-Lin Tsai ◽  
Jie-Lin Tzeng ◽  
Keng-Chun Hu ◽  
Hsu-Kang Li ◽  
Zu-Yu Pan ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Fept Film ◽  
Intermediate Layers ◽  
Microstructure And Magnetic Properties

scholarly journals Influence of an MgTiTaON Inserted Layer on Magnetic Properties and Microstructure of FePtAgC Films

Coatings ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 238 ◽  
Author(s):  
Jai-Lin Tsai ◽  
Cheng Dai ◽  
Jyun-you Chen ◽  
Ting-Wei Hsu ◽  
Shi-Min Weng ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Cross Section ◽  
Lattice Relaxation ◽  
Fept Film ◽  
Perpendicular Magnetization ◽  
Aspect Ratios ◽  
Out Of Plane ◽  
Temperature Deposition ◽  
Critical Lattice ◽  
C 30

The FePt film above 10 nm critical lattice relaxation thickness was prepared and the ultrathin MgTiTaON layer was interleaved in between FePt film and the multilayer stack is FePt(6 nm)/[MgTiTaON(1 nm)/FePt(4 nm)]2. Next, the FePt films were co-sputtered with (Ag, C) segregants during deposition and the layer stacks is FePt(6 nm)(Ag, C)(x vol %)/[MgTiTaON (1 nm)/FePt(4 nm)(Ag, C) (x vol %)]2 (x = 0, 10, 20, 30, 40). After high temperature deposition at 470 °C, the granular FePt(Ag, C, MgTiTaON) film illustrated perpendicular magnetization and the out-of-plane coercivity (Hc) was increased with (Ag, C) segregants and the highest Hc is 18.3 kOe when x = 40. From cross-section images, the FePt layer are more continuous with 0 and 10 vol% (Ag, C) segregants and changed to an island structure when the (Ag, C) segregants increase to 20–40 vol %. The FePt grains were grown in separated islands in 20, 30 vol % (Ag, C) and changed to dense columnar-like morphology in 40 vol%. The second nucleated grains which contribute the in-plane magnetization are found in FePt (Ag, C) (40 vol %) film. The FePt islands are reached by inserting the ultrathin MgTiTaON layer and the island heights of FePt(Ag, C) (30, 40 vol %) are around 31–38 nm and the aspect ratios are 0.6–0.8.

Preparation of FePt Film via Electrochemical Deposition Method

2011 ◽  
Vol 415-417 ◽  
pp. 1933-1937
Author(s):  
Ying Ying Shen ◽  
Xue Yan Du ◽  
Shi Yi Shi ◽  
Cui Xia Li
Keyword(s):  
Magnetic Properties ◽  
Soft Magnetic Properties ◽  
Face Centered Cubic ◽  
Vibrating Sample Magnetometer ◽  
Deposition Method ◽  
Soft Magnetic ◽  
Fept Film ◽  
Applied Pulse ◽  
Electrochemical Deposition Method ◽  
Face Centered

Abstract. A FePt codeposition film was prepared via electrochemical codeposition process, where FeSO4•7H2O and H2PtCl6•6H2O were used as Fe source and Pt source，respectively. The composition and morphology of the FePt film were determined by the applied pulse potentials. Vibrating Sample Magnetometer (VSM) study show that the FePt film with Fe/Pt=1:1 was of soft magnetic properties, and its structure transformed from face-centered-cubic (fcc) to face-centred-tetragonal (fct) structure partly after it was annealed at 550°C for 30min in hydrogen (H2).

The Effect of Thickness on the Magnetic Anisotropy and Magnetic Properties of Single-Layered FePt Films by In Situ Annealing

2010 ◽  
Vol 123-125 ◽  
pp. 507-510
Author(s):  
S.C. Chen ◽  
T.H. Sun ◽  
C.L. Chang ◽  
Chih Long Shen ◽  
G.P. Lin ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Perpendicular Magnetic Anisotropy ◽  
Recording Media ◽  
Magnetic Recording Media ◽  
Fept Film ◽  
Perpendicular Magnetic Recording ◽  
High Density Recording

The FePt films with various thicknesses of 5 to 50 nm are deposited on Si(100) substrate without any underlayer by in-situ annealing at substrate temperature (Ts) of 620°C. A strong (001) texture of L10 FePt film is obtained and presents high perpendicular magnetic anisotropy as the film thickness increases to 30 nm. Further increasing the thickness to above 30 nm, the (111) orientation of L10 FePt is enhanced greatly, indicating that the quality of perpendicular magnetic anisotropy degrades when the FePt film is thicker than 30 nm. The single-layered FePt film with thickness of 30 nm by in-situ depositing at 620°C shows good perpendicular magnetic properties (perpendicular coercivity of 14.0 kOe, saturation magnetization of 473 emu/cm3 and perpendicular squareness of 0.96, respectively), which reveal its significant potential as perpendicular magnetic recording media for high-density recording.

scholarly journals Magnetic Properties and Microstructure of FePt(BN, Ag, C) Films

Coatings ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 358 ◽  
Author(s):  
Jai-Lin Tsai ◽  
Yu-Ren Chen ◽  
Jyun-You Chen ◽  
Ting-Wei Hsu ◽  
Cheng Dai ◽  
...  
Keyword(s):  
Contact Angle ◽  
Magnetic Properties ◽  
Intermediate Layer ◽  
Wall Motion ◽  
Domain Wall Motion ◽  
Fept Film ◽  
Grain Sizes ◽  
Out Of Plane ◽  
Vertical Contact ◽  
Microstructure And Magnetic Properties

The microstructure and magnetic properties of FePt(BN, Ag, C) granular films grown on the MgTiON intermediate layer with and without the MoC inserting layer were studied. Without the MoC inserting layer, the 6 nm thick FePt film is continuous, which favors the domain wall motion magnetization reversal process and shows a lower out-of-plane coercivity (Hc) value of 6.7 kOe. The FePt(BN, Ag, C) granular film was grown in ball- and square-like grains with an almost vertical contact angle, and the out-of-plane coercivity (Hc) was increased to 15.5 kOe. When the MoC with a thickness of 3 nm was capped on the MgTiON intermediate layer, the FePt grains with and without (BN, Ag, C) segregants were both formed in large trapezoidal islands with a low contact angle morphology. The out-of-plane Hc value changed from 14.9 to 13.2 kOe and the reduced coercivity was due to larger grain sizes and a lower ordering degree of the FePt(BN, Ag, C) film.

Effect of Annealing on Magnetic Properties and Domain Structures of FePt Thin Films by Rapid Thermal Annealing Technique

2009 ◽  
Vol 79-82 ◽  
pp. 911-914
Author(s):  
S.C. Chen ◽  
T.H. Sun ◽  
Po Cheng Kuo
Keyword(s):  
Grain Size ◽  
Magnetic Properties ◽  
Heating Rate ◽  
Domain Structure ◽  
Rapid Thermal Annealing ◽  
Annealing Time ◽  
Annealing Temperature ◽  
High Heating Rate ◽  
Fept Film ◽  
High Heating

Single-layered FePt films of 30 nm thick were annealed at temperature between 300 and 800 °C for 1–180 sec by a rapid thermal annealing (RTA) with a high heating rate of 100 °C/sec. It is found that both the grain size and magnetic domain size of the FePt film increase with increasing annealing temperature and annealing time. The FePt films exhibited soft magnetic properties and without domain images were observed by magnetic force microscope (MFM) when the films were post-annealed at below 500 °C for 180 sec. The in-plane coercivity (Hc//) and perpendicular coercivity (Hc⊥) of FePt film increases significantly to 7.5 and 6.5 kOe respectively as annealing temperature increases to 600 °C. When the annealing temperature is increased to 700 °C, they are increased to 11.1 and 9.5 kOe, respectively, and the domain structure inclines to isolated domain. However, further increasing the annealing temperature to 800 °C, the Hc// and Hc⊥ values decrease to 9.8 and 8.9 kOe respectively due to largely increase the grain size of FePt and change the domain structure from isolation to continuity. On the other hand, in order to transform the FePt film from disordered γ phase to the ordered L10 phase, the annealing time of over 3 seconds is necessary when the film was post-annealed at 700 °C with a high heating rate of 100 °C/sec by RTA technique.

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