scholarly journals Bulk FePt-based nanocomposite magnets with enhanced exchange coupling

2007 ◽  
Vol 102 (2) ◽  
pp. 023908 ◽  
Author(s):  
Chuan-Bing Rong ◽  
Vikas Nandwana ◽  
Narayan Poudyal ◽  
J. Ping Liu ◽  
Mikhail E. Kozlov ◽  
...  
Keyword(s):  
Exchange Coupling ◽  
Nanocomposite Magnets

Determination of interface layer effects on magnetic properties of nanocomposite magnets and exchange coupling between magnetic entities

2019 ◽  
Vol 480 ◽  
pp. 454-462 ◽  
Author(s):  
Nadeem Abbas ◽  
Fang Wang ◽  
Hanyang Ren ◽  
J. Ping Liu ◽  
Weixing Xia ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Exchange Coupling ◽  
Interface Layer ◽  
Nanocomposite Magnets

Exchange Coupling in MnAlC/α-Fe Nanocomposite Magnets

2018 ◽  
Vol 31 (12) ◽  
pp. 3941-3947 ◽  
Author(s):  
J. S. Trujillo Hernandez ◽  
F. Maccari ◽  
L. G. Marshall ◽  
Jesús A. Tabares ◽  
G. A. Pérez Alcázar
Keyword(s):  
Exchange Coupling ◽  
Nanocomposite Magnets

scholarly journals Magnetic Phase Coexistence and Hard–Soft Exchange Coupling in FePt Nanocomposite Magnets

Nanomaterials ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1618
Author(s):  
O. Crisan ◽  
I. Dan ◽  
P. Palade ◽  
A. D. Crisan ◽  
A. Leca ◽  
...  
Keyword(s):  
Exchange Coupling ◽  
Hysteresis Loops ◽  
Squid Magnetometry ◽  
X Ray Diffraction ◽  
Soft Magnetic ◽  
Magnetic Phases ◽  
X Ray ◽  
Annealing Temperatures ◽  
Nanocomposite Magnets ◽  
Inflection Points

With the aim of demonstrating phase coexistence of two magnetic phases in an intermediate annealing regime and obtaining highly coercive FePt nanocomposite magnets, two alloys of slightly off-equiatomic composition of a binary Fe-Pt system were prepared by dynamic rotation switching and ball milling. The alloys, with a composition Fe53Pt47 and Fe55Pt45, were subsequently annealed at 400 °C and 550 °C and structurally and magnetically characterized by means of X-ray diffraction, 57Fe Mössbauer spectrometry and Superconducting Quantum Interference Device (SQUID) magnetometry measurements. Gradual disorder–order phase transformation and temperature-dependent evolution of the phase structure were monitored using X-ray diffraction of synchrotron radiation. It was shown that for annealing temperatures as low as 400 °C, a predominant, highly ordered L10 phase is formed in both alloys, coexisting with a cubic L12 soft magnetic FePt phase. The coexistence of the two phases is evidenced through all the investigating techniques that we employed. SQUID magnetometry hysteresis loops of samples annealed at 400 °C exhibit inflection points that witness the coexistence of the soft and hard magnetic phases and high values of coercivity and remanence are obtained. For the samples annealed at 500 °C, the hysteresis loops are continuous, without inflection points, witnessing complete exchange coupling of the hard and soft magnetic phases and further enhancement of the coercive field. Maximum energy products comparable with values of current permanent magnets are found for both samples for annealing temperatures as low as 500 °C. These findings demonstrate an interesting method to obtain rare earth-free permanent nanocomposite magnets with hard–soft exchange-coupled magnetic phases.

From FePt–Fe3O4 to L10-FePt–Fe nanocomposite magnets with a gradient interface

2015 ◽  
Vol 3 (27) ◽  
pp. 7075-7080 ◽  
Author(s):  
Weiwei Yang ◽  
Wenjuan Lei ◽  
Yongsheng Yu ◽  
Wenlei Zhu ◽  
T. A. George ◽  
...  
Keyword(s):  
Exchange Coupling ◽  
Nanocomposite Magnets

Exchange-coupling L10-FePt–bcc-Fe nanocomposites with a gradient interface is obtained from annealing FePt and FePt–Fe3O4 dumbbell shaped NPs.

scholarly journals Formation of strong L10-FePd/α-Fe nanocomposite magnets by visualizing efficient exchange coupling

2019 ◽  
Vol 1 (7) ◽  
pp. 2598-2605 ◽  
Author(s):  
Kenshi Matsumoto ◽  
Ryota Sato ◽  
Thang Thuy Trinh ◽  
Noritsugu Sakuma ◽  
Tetsuya Shoji ◽  
...  
Keyword(s):  
Exchange Coupling ◽  
Phase Segregation ◽  
Nanocomposite Magnets ◽  
Segregation Structure

FORC analysis distinguished a microscopically undetectable difference in phase-segregation structure in nanocomposite magnets, finding both efficient and inefficient exchange coupling.

Exchange Coupling Interaction in L10-FePd/α-Fe Nanocomposite Magnets with Large Maximum Energy Products

ACS Nano ◽  
2011 ◽  
Vol 5 (4) ◽  
pp. 2806-2814 ◽  
Author(s):  
Noritsugu Sakuma ◽  
Tsubasa Ohshima ◽  
Tetsuya Shoji ◽  
Yoshihito Suzuki ◽  
Ryota Sato ◽  
...  
Keyword(s):  
Exchange Coupling ◽  
Maximum Energy ◽  
Coupling Interaction ◽  
Nanocomposite Magnets ◽  
Exchange Coupling Interaction ◽  
Large Maximum ◽  
Energy Products

scholarly journals Characterization of Exchange Coupling in Nanocomposite Magnets by Ferromagnetic Resonance.

2001 ◽  
Vol 25 (4−2) ◽  
pp. 675-678
Author(s):  
H. Kato ◽  
M. Ishizone ◽  
T. Miyazaki ◽  
K. Koyama ◽  
H. Nojiri ◽  
...  
Keyword(s):  
Ferromagnetic Resonance ◽  
Exchange Coupling ◽  
Nanocomposite Magnets

Fabrication, characterization, and magnetic properties of exchange-coupled porous BaFe8Al4O19/Co0.6Zn0.4Fe2O4 nanocomposite magnets

Nanoscale ◽  
2019 ◽  
Vol 11 (22) ◽  
pp. 10629-10635 ◽  
Author(s):  
Guanghui Han ◽  
Yequn Liu ◽  
Weiwei Yang ◽  
Shuo Geng ◽  
Weibin Cui ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Exchange Coupling ◽  
Combustion Method ◽  
Nanocomposite Magnets ◽  
Auto Combustion ◽  
Porous Microstructure

BaFe8Al4O19/Co0.6Zn0.4Fe2O4 nanocomposite magnets with a porous microstructure and efficient exchange-coupling were obtained via a facile auto-combustion method.

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