Microstructure versus magnetic properties correlations in melt-spun Hf-Zr-Co-Fe-B alloys: role of thermal treatment

2018 ◽  
Vol 5 (6) ◽  
pp. 066104 ◽  
Author(s):  
Nithya Christopher ◽  
Kritika Anand ◽  
A K Srivastava ◽  
Anurag Gupta ◽  
Nidhi Singh
2019 ◽  
Vol 492 ◽  
pp. 165723 ◽  
Author(s):  
Premkumar Murugaiyan ◽  
Amitava Mitra ◽  
Arun Kumar Patro ◽  
Rajat K. Roy ◽  
M. Churyukanova ◽  
...  

2002 ◽  
Vol 753 ◽  
Author(s):  
I. Betancourt ◽  
R. Valenzuela

ABSTRACTWe present a detailed investigation of the role of the disorder degree on magnetic properties for melt spun and die cast intermetallic Nd-Fe-Al-based alloys. For melt spun alloys, the roll speed was varied between 30 m/s and 5 m/s, which resulted in a clear dependence of coercivity on increasing roll speed, showing a steep decrease (from 250 kA/m to 10 kA/m). The results are interpreted in terms of a gradual transition from fully disordered microstructure (30 m/s sample) to short range ordered one (i.e., a clustered microstructure at 5 m/s), which is a consequence of a diminished cooling rate. On the other hand, die-cast alloy affords cluster formation due to this very low cooling rate compared with the melt spinning process and in consequence, coercivity values of 284 kA/m were observed. Further alloying addition (B, Cu, Dy) on the original Nd-Fe-Al composition, exhibited coercivity enhancement (up to 388 kA/m) due to the presence of small Nd-based crystallites, which act as pinning centers.


2018 ◽  
Vol 8 (1) ◽  
Author(s):  
Swati R. Gawali ◽  
Ashish Chhaganlal Gandhi ◽  
Shrikrushna Shivaji Gaikwad ◽  
Jayashree Pant ◽  
Ting-Shan Chan ◽  
...  

1995 ◽  
Vol 179-181 ◽  
pp. 551-556
Author(s):  
Narcis Clavaguera ◽  
J.M. Machado da Silva ◽  
J.B. Oliveira ◽  
J.A. Diego ◽  
Maria T. Clavaguera-Mora

2017 ◽  
Vol 13 (1) ◽  
pp. 4486-4494 ◽  
Author(s):  
G.El Damrawi ◽  
F. Gharghar

Cerium oxide in borate glasses of composition xCeO2·(50 − x)PbO·50B2O3 plays an important role in changing both microstructure and magnetic behaviors of the system. The structural role of CeO2 as an effective agent for cluster and crystal formation in borate network is clearly evidenced by XRD technique. Both structure and size of well-formed cerium separated clusters have an effective influence on the structural properties. The cluster aggregations are documented to be found in different range ordered structures, intermediate and long range orders are the most structures in which cerium phases are involved. The nano-sized crystallized cerium species in lead borate phase are evidenced to have magnetic behavior.  The criteria of building new specific borate phase enriched with cerium as ferrimagnetism has been found to keep the magnetization in large scale even at extremely high temperature. Treating the glass thermally or exposing it to an effective dose of ionized radiation is evidenced to have an essential change in magnetic properties. Thermal heat treatment for some of investigated materials is observed to play dual roles in the glass matrix. It can not only enhance alignment processes of the magnetic moment but also increases the capacity of the crystallite species in the magnetic phases. On the other hand, reverse processes are remarked under the effect of irradiation. The magnetization was found to be lowered, since several types of the trap centers which are regarded as defective states can be produced by effect of ionized radiation. 


2021 ◽  
Vol 260 ◽  
pp. 124178
Author(s):  
Pavel Veverka ◽  
Lenka Kubíčková ◽  
Zdeněk Jirák ◽  
Vít Herynek ◽  
Miroslav Veverka ◽  
...  

Author(s):  
Hasitha Ganegoda ◽  
Soham Mukherjee ◽  
Beihai Ma ◽  
Daniel T. Olive ◽  
James H. McNeely ◽  
...  

2021 ◽  
Author(s):  
Jyoti Saini ◽  
Monika Sharma ◽  
Bijoy Kumar Kuanr

Functional magnetic oxide particles offer exceptional GHz frequency capabilities, which can significantly enhance the utility of communication and signal processing devices.


Sign in / Sign up

Export Citation Format

Share Document