The effect of magnetic field annealing on magnetic properties in ultrathin Fe-based nanocrystalline alloys

1997 ◽  
Vol 33 (5) ◽  
pp. 3799-3801 ◽  
Author(s):  
J.Y. Park ◽  
S.J. Suh ◽  
K.Y. Kim ◽  
T.H. Noh
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Nanocrystalline Alloys ◽  
Field Annealing

scholarly journals Effects of Perpendicular Magnetic Field Annealing on the Structural and Magnetic Properties of [Co/Ni]2/PtMn Thin Films

2021 ◽  
Vol 7 (3) ◽  
pp. 38
Author(s):  
Roshni Yadav ◽  
Chun-Hsien Wu ◽  
I-Fen Huang ◽  
Xu Li ◽  
Te-Ho Wu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Thin Films ◽  
Magnetic Properties ◽  
Photoelectron Spectroscopy ◽  
Perpendicular Magnetic Field ◽  
Face Centered Cubic ◽  
Lattice Image ◽  
X Ray ◽  
Field Annealing ◽  
Face Centered

In this study, [Co/Ni]2/PtMn thin films with different PtMn thicknesses (2.7 to 32.4 nm) were prepared on Si/SiO2 substrates. The post-deposition perpendicular magnetic field annealing (MFA) processes were carried out to modify the structures and magnetic properties. The MFA process also induced strong interlayer diffusion, rendering a less sharp interface between Co and Ni and PtMn layers. The transmission electron microscopy (TEM) lattice image analysis has shown that the films consisted of face-centered tetragonal (fct) PtMn (ordered by MFA), body-centered cubic (bcc) NiMn (due to intermixing), in addition to face-centered cubic (fcc) Co, Ni, and PtMn phases. The peak shift (2-theta from 39.9° to 40.3°) in X-ray diffraction spectra also confirmed the structural transition from fcc PtMn to fct PtMn after MFA, in agreement with those obtained by lattice images in TEM. The interdiffusion induced by MFA was also evidenced by the depth profile of X-ray photoelectron spectroscopy (XPS). Further, the magnetic properties measured by vibrating sample magnetometry (VSM) have shown an increased coercivity in MFA-treated samples. This is attributed to the presence of ordered fct PtMn, and NiMn phases exchange coupled to the ferromagnetic [Co/Ni]2 layers. The vertical shift (Mshift = −0.03 memu) of the hysteresis loops is ascribed to the pinned spins resulting from perpendicular MFA processes.

Effects of Magnetic-Field Annealing on the Morphology and Magnetic Properties of La0.7Sr0.3MnO3 Film

2012 ◽  
Vol 170 (5-6) ◽  
pp. 302-306
Author(s):  
Z. F. Zi ◽  
Q. C. Liu ◽  
X. W. Tang ◽  
J. G. Lv ◽  
J. M. Dai ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Field Annealing

Influence of interdiffusion on the magnetic properties of Co/Si (100) films after high magnetic field annealing

2015 ◽  
Vol 387 ◽  
pp. 6-12 ◽  
Author(s):  
Yue Zhao ◽  
Kai Wang ◽  
Qiang Wang ◽  
Guojian Li ◽  
Changsheng Lou ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
High Magnetic Field ◽  
Field Annealing

Magnetic Field Annealing Effects on Magnetic Properties of Electrodeposited Co/Cu Multilayered Nanowires

2014 ◽  
Vol 50 (8) ◽  
pp. 1-4 ◽  
Author(s):  
Khalid Javed ◽  
Da Wei Shi ◽  
Syed Shahbaz Ali ◽  
Jun Jiang ◽  
Pan Liu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Annealing Effects ◽  
Field Annealing ◽  
Multilayered Nanowires

High Magnetic Field Annealing of Mn-Ga Intermetallic Alloys

MRS Advances ◽  
2015 ◽  
Vol 1 (3) ◽  
pp. 227-233 ◽  
Author(s):  
Daniel R. Brown ◽  
Ke Han ◽  
Theo Siegrist ◽  
Tiglet Besara ◽  
Rongmei Niu
Keyword(s):  
Magnetic Field ◽  
Heat Treatment ◽  
Magnetic Properties ◽  
Permanent Magnets ◽  
Intermetallic Alloys ◽  
Nanostructured Composite ◽  
Refined Microstructure ◽  
Field Annealing ◽  
High Magnetic Moment ◽  
Hard Magnetic Properties

AbstractMn-Ga alloys have shown promising hard magnetic properties, even though these alloys contain no rare-earth metals. However, much work is needed before Mn-Ga alloys become viable permanent magnets for applications. One of the challenges is to enhance the remanence. One technique to improve this property is applying a magnetic field during the heat treatment process. Magnetic annealing can promote phase transformation of the phases with high magnetic moment. This results in an increased remanence. Bulk samples of Mn-Ga alloys were made by mechanically alloying in order to create a nanostructured composite, followed by heat treatments in the presence of a 31 T magnetic field. The heat treatment temperatures were kept low in order to keep the refined microstructure. All the alloys exhibit hard magnetic properties at room temperature with large coercivity. This work reports findings of magnetic field annealed Mn-Ga bulk that exhibit high coercivities up to 19.4 kOe and increased remanence of 50% over the binary system, achieving values up to 6.9 emu/g. This is the highest coercivity reported in bulk Mn-Ga samples.

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