Exchange hardening in nano-structured two-phase permanent magnets

Schrefl, T.; Kronmüller, H.; Fidler, J.

doi:10.1016/0304-8853(93)90042-z

Cited by 208 publications

(66 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The condition of getting the exchange spring behaviour in the hard soft nanocomposite has already been predicted by the theoretical modelling. 11 According to the micromagnetic calculations in isotropic two phase magnets, the size of soft grains should ideally be about twice that of the domain wall width (δ w ) of the hard magnetic phase for obtaining enhanced magnetic property of nanocomposite magnet. 11 Moreover, the exchange and magnetic anisotropy are important factors for determining remanence and coercivity of the nancomposite.…”

Section: Introductionmentioning

confidence: 99%

“…11 According to the micromagnetic calculations in isotropic two phase magnets, the size of soft grains should ideally be about twice that of the domain wall width (δ w ) of the hard magnetic phase for obtaining enhanced magnetic property of nanocomposite magnet. 11 Moreover, the exchange and magnetic anisotropy are important factors for determining remanence and coercivity of the nancomposite. Therefore, correlation of the strength of exchange interaction between soft and hard phases of the nanocomposite, and the volume fraction of the hard-soft phases need to be investigated.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Exchange spring behaviour in SrFe12O19-CoFe2O4 nanocomposites

Roy

Kumar

2015

AIP Advances

View full text Add to dashboard Cite

Nanocomposites of hard (SrFe12O19) and soft ferrite (CoFe2O4) are prepared by mixing individual ferrite components at appropriate weight ratio and subsequent heat treatment. The magnetization of the composites showed hysteresis loop that is characteristic of the exchange spring system. The variation of Jr/Jr(∞) vs. Jd/ Jr(∞) for these nanocomposites are investigated to understand the presence of both the interacting field and the disorder in the system. This is further corroborated with the First Order Reversal Curve analysis (FORC) on the nanocomposites of 1:4 (Cobalt Ferrite: Strontium Ferrite) and 1:16 (Cobalt Ferrite: Strontium Ferrite). The FORC distribution reveals that the pinning mechanism is stronger in the nanocomposite of 1:4 compared to 1:16. However, the nanocomposite of 1:16 exhibit superior exchange coupling strength in contrast to 1:4. The asymmetric nature of the FORC distribution at Hc = 0 Oe for both the nanocomposites validates the intercoupling between the reversible and irreversible magnetization.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Exchange spring behaviour in SrFe12O19-CoFe2O4 nanocomposites

Roy

Kumar

2015

AIP Advances

View full text Add to dashboard Cite

show abstract

“…have been investigated by a variety of techniques in the equilibrium statistical physics. The first reason is that they have a wide possibility of technological applications, such as ultrahigh-density magnetic storage devices [19], sensors [20], permanent magnets [21], and medical applications [22].…”

Section: Introductionmentioning

confidence: 99%

Hysteresis and compensation behaviors of spin-3/2 cylindrical Ising nanotube system

Kocakaplan

Keskín

2014

Journal of Applied Physics

View full text Add to dashboard Cite

An effective-field theory with correlations has been used to study the hysteresis, susceptibility and compensation behaviors of the spin-1 hexagonal Ising nanowire (HIN) with core-shell structure. The effects of the temperature, crystal field, core-shell interfacial coupling and shell surface coupling are investigated on hysteresis and compensation behaviors, in detail. When the core-shell interfacial coupling is weak, the double and triple hysteresis loops can be seen in the system. The hysteresis loops have different coercive field points that the susceptibility make peak at these points. Moreover, we observed that the system displays the Q-, R-, S-, P-, N-and W-types of compensation behaviors according to Neél classification nomenclature.Finally, the obtaining results are compared with some experimental and theoretical results and found a good agreement.

show abstract

“…[1][2][3][4] Magnetic exchange coupling provides a possible solution to this problem. [5][6][7] An exchange coupled magnet contains both magnetic hard and soft phases distributed at nano scale. Due to the exchange coupling effects, the magnetization direction of the soft phase is pinned to the direction of the hard phase.…”

Section: Introductionmentioning

confidence: 99%

“…At the same time, the exchange coupled magnets make use of the high magnetization of the soft phase, and high coercivity of the hard phase. [5][6][7] Thus, the (BH) max of the exchange coupled magnet can be improved from the single hard phase. Experimentally, exchange coupled magnets can be achieved in three configurations, including hard/soft core/shell particles, 9,10 composites, 11,12 and hybrid thin films.…”

Section: Introductionmentioning

confidence: 99%

Ex situ synthesis of magnetically exchange coupled SrFe12O19/Fe-Co composites

Hong

Park

et al. 2016

AIP Advances

View full text Add to dashboard Cite

Magnetically exchange coupled SrFe12O19/Fe-Co composites with different mass percentage of Fe-Co were synthesized through an ex situ process. The morphology, magnetic properties, and crystallization of SrFe12O19/Fe-Co composites were investigated. Lower mass percentage of Fe-Co presented an even distribution of Fe-Co nanoparticles on the surface of SrFe12O19, and effective magnetic exchange coupling between Fe-Co and SrFe12O19. Higher mass percentage of Fe-Co leads to an agglomeration of Fe-Co nanoparticles on SrFe12O19 surface, and a weak magnetic exchange coupling between Fe-Co and SrFe12O19. This ex situ process proposed a new method to synthesize magnetically exchange coupled SrFe12O19/Fe-Co core/shell composites with precise control of the magnetic properties. This method can also be potentially used for other hard/soft magnetic composite synthesis.

show abstract

Exchange hardening in nano-structured two-phase permanent magnets

Cited by 208 publications

References 10 publications

Exchange spring behaviour in SrFe12O19-CoFe2O4 nanocomposites

Exchange spring behaviour in SrFe12O19-CoFe2O4 nanocomposites

Hysteresis and compensation behaviors of spin-3/2 cylindrical Ising nanotube system

Ex situ synthesis of magnetically exchange coupled SrFe12O19/Fe-Co composites

Contact Info

Product

Resources

About