Increases in effective head field gradients in exchange spring media

Lee, Je-Hyun; Suess, Dieter; Schrefl, T.; Dean, J.; Fidler, J.

doi:10.1063/1.3257364

Cited by 4 publications

(2 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[1][2][3][4][5][6][7][8] The proposition for exchange spring concept has been attributed to Knellers and Hawig. 9 They proposed an enhancement in content of transition metal in permanent magnets by making a nanocomposite comprising exchange-coupled hard and soft magnetic phases.…”

Section: Introductionmentioning

confidence: 99%

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%

Exchange spring behaviour in SrFe12O19-CoFe2O4 nanocomposites

Roy

Kumar

2015

AIP Advances

View full text Add to dashboard Cite

show abstract

“…SUL, as indicated by Wang et al will help sharpen transitions during recording. ECC granular/continuous media are well known for thermally stable PMR . Regarding HAMR, there are many ECC activities aiming to optimize media.…”

Section: Sputtered Hamr Mediamentioning

confidence: 99%

L1₀ FePtX-Y media for heat-assisted magnetic recording

Weller

Mosendz

Parker

et al. 2013

Phys. Status Solidi A

201

118

View full text Add to dashboard Cite

Highly chemically ordered L1 0 FePtX-Y nano-granular films with high perpendicular magnetic anisotropy are key media approaches for future heat-assisted magnetic recording (HAMR). They are sputtered at elevated temperature on glass disks coated with adhesion, heat sink, and texturing layers. Adding X ¼ Ag reduces the required deposition temperature and X ¼ Cu lowers the Curie temperature. Current seed layers are NiTa for adhesion and heat sink and well-oriented MgO (002) layers for highly textured FePtX(002) grains surrounded by Y ¼ carbon and/or other segregants. Magnetic anisotropies larger than 4.5 Â 10 7 erg cm À3 and coercivities beyond 5 Tesla have been achieved. The combination of thermal conductivity and Curie temperature determines the required laser power during recording. Key goals are to optimize media, heads, head-disk-spacing, and read-back channels to extend the areal density to 1.5-5 Tb in À2

show abstract