Simultaneous enhancement of anisotropy and grain isolation in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>CoPtCr-SiO</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>perpendicular recording media by a MnRu intermediate layer

Liao, Jung-Wei; Dumas, Randy K.; Hou, Hao-Cheng; Huang, Yu-Che; Tsai, Wen‐Hui; Wang, Liang-Wei; Wang, Ding-Shuo; Lin, Mingli; Wu, Yung-Chun; Chen, Rongzhi; Chiu, Chien‐Liang; Lau, June W.; Liu, Kai; Lai, Chih‐Huang

doi:10.1103/physrevb.82.014423

Cited by 17 publications

(4 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The layers have different anisotropy field values, as well as different intergranular exchange values. This is done in order to reduce the switching field while maintaining thermal stability [11], [12]. The reversal mechanism in these multilayer films differs from the Stoner-Wohlfarth model, and proceeds through incoherent rotation of magnetization in the various layers (exchange coupled composite media effect [13], or vertical domain wall motion reversal [14]).…”

Section: Introductionmentioning

confidence: 99%

Fingerprinting Inhomogeneities in Recording Media Using the First-Order Reversal Curve Method

2011

Self Cite

View full text Add to dashboard Cite

Understanding how interactions within magnetic systems affect the reversal process is critical to the development of magnetic recording media. Using the first-order reversal curve (FORC) method we demonstrate an ability to map out and uniquely identify magnetic recording media. We evaluate the interactions and intrinsic switching field distribution (SFD) in single layer and exchange coupled composite granular recording media. Landau-Lifshitz-Gilbert-based simulations are used to probe the roles lateral and vertical exchange interactions have on the distribution of reversal events. We find that there is an optimal value for these terms which maximizes homogeneity of the reversal behavior.

show abstract

Section: Introductionmentioning

confidence: 99%

Fingerprinting Inhomogeneities in Recording Media Using the First-Order Reversal Curve Method

2011

Self Cite

View full text Add to dashboard Cite

show abstract

“…The dominant magnetic interaction was also probed with ΔM measurements353637: , where M DCD ( H ), M IRM ( H ) and M R are the dc demagnetization remanence, isothermal remanence, and saturation remanence, respectively. The value of ΔM is typically positive for magnetizing (exchange) interactions, and negative for demagnetizing (dipolar) interactions173537. Atomic and magnetic force microscopy (AFM/MFM) were performed using a low-moment CoCr coated Si cantilever, in phase-detection mode.…”

Section: Methodsmentioning

confidence: 99%

“…The value of M will be positive for magnetizing (exchange) interactions, and negative for demagnetizing (dipolar) interactions. 17,35,37 Atomic and magnetic force microscopy (AFM/MFM) were performed using a low-moment CoCr coated Si cantilever, in phase-detection mode.…”

Section: Characterizations Magnetic Properties Were Measured By a Vib...mentioning

confidence: 99%

“…These interactions are often complicated and correlated, e.g., exchange interaction within each grain vs. dipolar interactions across neighboring grains, which directly impact the media performance such as the thermal stability and switching field distribution. Careful balance of these interactions, e.g., through the introduction of boron or oxides at grain boundaries 16 17 , has been essential to optimizing the media performance. Another example is the exchange coupled media that uses a magnetically hard layer to anchor the thermal stability, while writeablity is achieved by exchange coupling to a neighboring magnetically soft layer 18 19 20 .…”

mentioning

confidence: 99%

See 1 more Smart Citation

Magnetic Yoking and Tunable Interactions in FePt-Based Hard/Soft Bilayers

Gilbert

Liao

Kirby

et al. 2016

Sci Rep

Self Cite

View full text Add to dashboard Cite

Magnetic interactions in magnetic nanostructures are critical to nanomagnetic and spintronic explorations. Here we demonstrate an extremely sensitive magnetic yoking effect and tunable interactions in FePt based hard/soft bilayers mediated by the soft layer. Below the exchange length, a thin soft layer strongly exchange couples to the perpendicular moments of the hard layer; above the exchange length, just a few nanometers thicker, the soft layer moments turn in-plane and act to yoke the dipolar fields from the adjacent hard layer perpendicular domains. The evolution from exchange to dipolar-dominated interactions is experimentally captured by first-order reversal curves, the ΔM method, and polarized neutron reflectometry, and confirmed by micromagnetic simulations. These findings demonstrate an effective yoking approach to design and control magnetic interactions in wide varieties of magnetic nanostructures and devices.

show abstract

Epitaxial Growth of Large‐Scale 2D CrTe₂ Films on Amorphous Silicon Wafers With Low Thermal Budget

Zhang,

Li,

et al. 2024

Advanced Materials

View full text Add to dashboard Cite

Abstract2D van der Waals (vdW) magnets open landmark horizons in the development of innovative spintronic device architectures. However, their fabrication with large scale poses challenges due to high synthesis temperatures (>500 °C) and difficulties in integrating them with standard complementary metal‐oxide semiconductor (CMOS) technology on amorphous substrates such as silicon oxide (SiO2) and silicon nitride (SiNx). Here, a seeded growth technique for crystallizing CrTe2 films on amorphous SiNx/Si and SiO2/Si substrates with a low thermal budget is presented. This fabrication process optimizes large‐scale, granular atomic layers on amorphous substrates, yielding a substantial coercivity of 11.5 kilo‐oersted, attributed to weak intergranular exchange coupling. Field‐driven Néel‐type stripe domain dynamics explain the amplified coercivity. Moreover, the granular CrTe2 devices on Si wafers display significantly enhanced magnetoresistance, more than doubling that of single‐crystalline counterparts. Current‐assisted magnetization switching, enabled by a substantial spin–orbit torque with a large spin Hall angle (85) and spin Hall conductivity (1.02 × 107 ℏ/2e Ω⁻¹ m⁻¹), is also demonstrated. These observations underscore the proficiency in manipulating crystallinity within integrated 2D magnetic films on Si wafers, paving the way for large‐scale batch manufacturing of practical magnetoelectronic and spintronic devices, heralding a new era of technological innovation.

show abstract

Simultaneous enhancement of anisotropy and grain isolation inCoPtCr-SiO2perpendicular recording media by a MnRu intermediate layer

Cited by 17 publications

References 24 publications

Fingerprinting Inhomogeneities in Recording Media Using the First-Order Reversal Curve Method

Fingerprinting Inhomogeneities in Recording Media Using the First-Order Reversal Curve Method

Magnetic Yoking and Tunable Interactions in FePt-Based Hard/Soft Bilayers

Epitaxial Growth of Large‐Scale 2D CrTe₂ Films on Amorphous Silicon Wafers With Low Thermal Budget

Contact Info

Product

Resources

About

Simultaneous enhancement of anisotropy and grain isolation inCoPtCr-SiO2perpendicular recording media by a MnRu intermediate layer

Cited by 17 publications

References 24 publications

Fingerprinting Inhomogeneities in Recording Media Using the First-Order Reversal Curve Method

Fingerprinting Inhomogeneities in Recording Media Using the First-Order Reversal Curve Method

Magnetic Yoking and Tunable Interactions in FePt-Based Hard/Soft Bilayers

Epitaxial Growth of Large‐Scale 2D CrTe2 Films on Amorphous Silicon Wafers With Low Thermal Budget

Contact Info

Product

Resources

About

Epitaxial Growth of Large‐Scale 2D CrTe₂ Films on Amorphous Silicon Wafers With Low Thermal Budget