Enhanced Magnetocaloric Effect Driven by Interfacial Magnetic Coupling in Self-Assembled Mn3O4–La0.7Sr0.3MnO3 Nanocomposites

2015 ◽  
Vol 7 (48) ◽  
pp. 26504-26511 ◽  
Author(s):  
Suresh K. Vandrangi ◽  
Jan-Chi Yang ◽  
Yuan-Min Zhu ◽  
Yi-Ying Chin ◽  
Hong-Ji Lin ◽  
...  
Keyword(s):  
Magnetocaloric Effect ◽  
Magnetic Coupling ◽  
Self Assembled

scholarly journals Magnetic coupling between Gd and Pr ions and magnetocaloric effect in Gd0.5Pr0.5Al2 compound

2009 ◽  
Vol 321 (19) ◽  
pp. 3014-3018 ◽  
Author(s):  
A. Magnus G. Carvalho ◽  
F. Garcia ◽  
V.S.R. de Sousa ◽  
P.J. von Ranke ◽  
D.L. Rocco ◽  
...  
Keyword(s):  
Magnetocaloric Effect ◽  
Magnetic Coupling

scholarly journals Giant reversible magnetocaloric effect in flower-like β-Co(OH)2 hierarchical superstructures self-assembled by nanosheets

2013 ◽  
Vol 17 (1) ◽  
pp. 186-189 ◽  
Author(s):  
Xianguo Liu ◽  
Chao Feng ◽  
Feng Xiao ◽  
Siu Wing Or ◽  
Yuping Sun ◽  
...  
Keyword(s):  
Magnetocaloric Effect ◽  
Self Assembled

scholarly journals Mapping the Magnetic Coupling of Self-Assembled Fe3O4 Nanocubes by Electron Holography

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 774 ◽  
Author(s):  
Lluís López-Conesa ◽  
Carlos Martínez-Boubeta ◽  
David Serantes ◽  
Sonia Estradé ◽  
Francesca Peiró
Keyword(s):  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
Magnetic Induction ◽  
Theoretical Calculations ◽  
Magnetic Coupling ◽  
Magnetic Configuration ◽  
Electron Holography ◽  
Transmission Electron ◽  
Self Assembled ◽  
Good Agreement

The nanoscale magnetic configuration of self-assembled groups of magnetite 40 nm cubic nanoparticles has been investigated by means of electron holography in the transmission electron microscope (TEM). The arrangement of the cubes in the form of chains driven by the alignment of their dipoles of single nanocubes is assessed by the measured in-plane magnetic induction maps, in good agreement with theoretical calculations.

Synthesis of a new type of GdAl2nanocapsule with a large cryogenic magnetocaloric effect and novel coral-like aggregates self-assembled by nanocapsules

2006 ◽  
Vol 17 (21) ◽  
pp. 5406-5411 ◽  
Author(s):  
Song Ma ◽  
Dianyu Geng ◽  
Weishan Zhang ◽  
Wei Liu ◽  
Xiuliang Ma ◽  
...  
Keyword(s):  
Magnetocaloric Effect ◽  
New Type ◽  
Self Assembled

Grain separation enhanced magnetic coercivity in Pt/Co multilayers.

1993 ◽  
Vol 51 ◽  
pp. 1038-1039 ◽  
Author(s):  
G.A. Bertero ◽  
R. Sinclair
Keyword(s):  
Remanent Magnetization ◽  
Strong Influence ◽  
Uniaxial Anisotropy ◽  
Magnetic Coupling ◽  
Recording Media ◽  
Magnetic Media ◽  
Signal To Noise ◽  
Out Of Plane ◽  
Longitudinal Recording ◽  
The Relationship

Pt/Co multilayers displaying perpendicular (out-of-plane) magnetic anisotropy and 100% perpendicular remanent magnetization are strong candidates as magnetic media for the next generation of magneto-optic recording devices. The magnetic coercivity, Hc, and uniaxial anisotropy energy, Ku, are two important materials parameters, among others, in the quest to achieving higher recording densities with acceptable signal to noise ratios (SNR). The relationship between Ku and Hc in these films is not a simple one since features such as grain boundaries, for example, can have a strong influence on Hc but affect Ku only in a secondary manner. In this regard grain boundary separation provides a way to minimize the grain-to-grain magnetic coupling which is known to result in larger coercivities and improved SNR as has been discussed extensively in the literature for conventional longitudinal recording media.We present here results from the deposition of two Pt/Co/Tb multilayers (A and B) which show significant differences in their coercive fields.

Imaging magnetic microstructure with SEMPA

1993 ◽  
Vol 51 ◽  
pp. 1032-1033
Author(s):  
M. H. Kelley ◽  
J. Unguris ◽  
R. J. Celotta ◽  
D. T. Pierce
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Scanning Electron Microscopy ◽  
Sandwich Structure ◽  
Magnetic Coupling ◽  
Polarization Analysis ◽  
Secondary Electrons ◽  
Magnetic Microstructure ◽  
Escape Depth ◽  
Scanning Electron

By measuring the spin polarization of secondary electrons generated in a scanning electron microscope, scanning electron microscopy with polarization analysis (SEMPA) can directly image the magnitude and direction of a material’s magnetization. Because the escape depth of the secondaries is only on the order of 1 nm, SEMPA is especially well-suited for investigating the magnetization of ultra-thin films and surfaces. We have exploited this feature of SEMPA to study the magnetic microstrcture and magnetic coupling in ferromagnetic multilayers where the layers may only be a few atomic layers thick. For example, we have measured the magnetic coupling in Fe/Cr/Fe(100) and Fe/Ag/Fe(100) trilayers and have found that the coupling oscillates between ferromagnetic and antiferromagnetic as a function of the Cr or Ag spacer thickness.The SEMPA apparatus has been described in detail elsewhere. The sample consisted of a magnetic sandwich structure with a wedge-shaped interlayer as shown in Fig. 1.

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