CN101258542B - Magnetic recording medium and magnetic recording and reproducing device - Google Patents
Magnetic recording medium and magnetic recording and reproducing device Download PDFInfo
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- CN101258542B CN101258542B CN2006800329347A CN200680032934A CN101258542B CN 101258542 B CN101258542 B CN 101258542B CN 2006800329347 A CN2006800329347 A CN 2006800329347A CN 200680032934 A CN200680032934 A CN 200680032934A CN 101258542 B CN101258542 B CN 101258542B
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Abstract
The present invention has its object to offer magnetic recording medium and magnetic recording and reproducing device that can record and reproduce high density data by optimizing the soft magnetic layer material forming the soft magnetic underlayer and the under layer material. In the present invention, the perpendicular magnetic recording medium A has at least the soft magnetic underlayer a, the under layer 5, the intermediate layer 6 and the perpendicular magnetic recording layer on the non-magnetic substrate 1. The soft magnetic layers 2, 4 that form the soft magnetic underlayer a, has an amorphous structure and is made of CoA1 alloy or CoFeA1 alloy having saturation magnetic flux density Bs greater than 1.1T.
Description
The cross reference of related application
Require the right of priority of the Japanese patent application 2005-372064 of acquisition submission on Dec 26th, 2005.This application is an application of submitting to according to 35 U.S.C. § 111 (a), according to 35 U.S.C. § 119 (e), requires to obtain the applying date rights and interests in the provisional application 60/755,088 of submission on January 3rd, 2006 according to 35 U.S.C § 111 (b).
Technical field
The magnetic recording and the transcriber that the present invention relates to magnetic recording media and use this magnetic recording media.
Background technology
The easy magnetizing axis of the magnetic recording layer that normally in the magnetic recording media face, is orientated is redirected, can make near the demagnetizing field (demagnetizingfield) in magnetic transformation district (being the border between the recorded bit) become littler.So magnetostatic characteristic is stable when recording density increases, and the increase of heat resistanceheat resistant fluctuation property, so, perpendicular magnetic recording system be can the enhanced surface recording density appropriate system.
When the soft magnetism lining that is made up of soft magnetic material is provided between substrate and perpendicular magnetic recording layer, just become so-called vertical double-layer medium, can obtain high record performance.In this situation, the soft magnetism lining has the effect that the recording magnetic field from magnetic head is returned, thereby has strengthened record and reproduced efficient.
Usually suggestion is used such as non-crystalline materials such as CoZrNb, CoTaZr and FeCoB as the soft magnetic material that forms above-mentioned soft magnetism lining.For example, can use CoZr alloy (referring to patent document 1) or FeAlSi, FeTaN (referring to patent document 2).Propose various materials and be used for the lining on the above-mentioned soft magnetism lining.For example, can use such as Ti alloy (referring to patent document 3) and NiFeCr hcp structures such as (referring to patent documents 4) or such as non crystalline structures such as Ta.
If use CoZrNb or CoTaZr as above-mentioned soft magnetism lining, so, in the CoFe alloy in these two kinds of materials, the etching problem of Co or Fe can take place under high temperature and high humility.Observe, in adding the CoFe alloy of Fe with increase saturation magnetic flux density (Bs), this problem is more remarkable.
If in lining, use non-magnetic material, so, the distance between magnetic head and the soft magnetism lining surface can further increase because of the thickness of lining, and the thickness of soft magnetism lining has to increase so that can write fully.Through in lining, using material with soft magnetic characteristic, the effect of soft magnetism lining and be positioned at the crystal orientation in the middle layer above the lining can be controlled.Yet, observe, when in lining, using Ni, Ni alloy, NiFe alloy or NiCo alloy material, marked change can take place according to the soft magnetism lining material in crystal orientation.
Patent document 1: the japanese laid-open patent application discloses No.H6-282834 first.
Patent document 2: the japanese laid-open patent application discloses No.H11-149628 first.
Patent document 3: the open No.2669529 of Jap.P..
Patent document 4: the japanese laid-open patent application discloses No.2003-123239 first.
Summary of the invention
The magnetic recording media that the configuration of the magnetic recording media that the past proposed is not enough to obtain to have outstanding record and reproducing characteristic and has good throughput rate.All hope to find ways of addressing this issue and the easy magnetic recording media of making all the time.
After having considered above-mentioned situation, target of the present invention provides magnetic recording media and magnetic recording and transcriber, through optimizing soft ferromagnetic layer material and the lining material that constitutes the soft magnetism lining, can write down and reproduce high density data.
The present invention adopts following configuration to realize above-mentioned target.
(1) magnetic recording media of the present invention comprises the perpendicular magnetic recording medium that is formed by soft magnetism lining, lining, middle layer and perpendicular magnetic recording layer on non-magnetic substrate at least; Wherein, said soft magnetism lining comprises the soft ferromagnetic layer that has non crystalline structure and be made up of greater than the CoAl alloy of 1.1T saturation magnetic flux density Bs.
(2) magnetic recording media of the present invention comprises the perpendicular magnetic recording medium that is formed by soft magnetism lining, lining, middle layer and perpendicular magnetic recording layer on non-magnetic substrate at least; Wherein, said soft magnetism lining is made up of greater than the soft ferromagnetic layer of the alloy amorphous structure of CoFeAl of 1.4T saturation magnetic flux density Bs.
(3) in the magnetic recording media of the present invention, the content of Al is greater than 0.2at% but less than 7at% in the said soft ferromagnetic layer.
(4) in the magnetic recording media of the present invention, the content of Al is greater than 0.3at% but less than 3at% in the said soft ferromagnetic layer.
(5) in the magnetic recording media of the present invention, the content of Fe is less than 50at% in the said soft ferromagnetic layer.
(6) magnetic recording media of the present invention also comprises one of Ta, Nb or Zr composition as said soft ferromagnetic layer at least.
(7) magnetic recording media of the present invention also comprises Ni or the Cr composition as said soft ferromagnetic layer.
(8) magnetic recording media of the present invention has the soft magnetism lining, and this soft magnetism lining comprises two-layer AFC (antiferromagnetic coupling, Anti-Ferro-Coupling) structure and the Ru film that between this two-layer soft ferromagnetic layer, forms.
(9) in the magnetic recording media of the present invention, the long-pending Bst (Tnm) of the saturation magnetic flux density of said soft magnetism lining and thickness is greater than 3 but less than 8.
(10) in the magnetic recording media of the present invention, said lining material is Ni, Ni alloy, NiFe alloy or NiCo alloy, and the A θ 50 of position said Ru alloy on it is less than 6 degree.
(11) in the magnetic recording media of the present invention, said middle layer is made up of Ru or Ru alloy.
(12) in the magnetic recording media of the present invention, the thickness of said soft magnetism lining is greater than 20nm but less than 80nm.
(13) in the magnetic recording media of the present invention, the thickness in said middle layer is less than 16nm.
(14) in the magnetic recording media of the present invention, said soft ferromagnetic layer is CoFeAlZrNb, CoFeAlHfNb, CoFeAlTaNb, CoFeAlZrNbCr or CoFeAlZrNbNi.
(15) magnetic recording media of the present invention also has the restraining barrier between said non-magnetic substrate and said soft magnetism lining.
(16) in the magnetic recording media of the present invention, the essential element that said restraining barrier comprised is selected from the element except that Co and Fe in the element that the soft magnetism lining comprised.
(17) in the magnetic recording media of the present invention, said restraining barrier has non crystalline structure.
(18) in the magnetic recording media of the present invention, the thickness on said restraining barrier is greater than 1nm but less than 20nm.
(19) magnetic recording of the present invention and transcriber comprise magnetic recording media and are used on said magnetic recording media the magnetic head of record and information reproduction; Wherein, Said magnetic head is single magnetic pole magnetic head, and said magnetic recording media is the magnetic recording media according to (1) any one in (18).
As stated; According to the present invention; Perpendicular magnetic recording medium comprises soft magnetism lining, lining, middle layer and perpendicular magnetic recording layer at least on non-magnetic substrate; Wherein, be made up of the CoAl alloy greater than the soft magnetism lining that the soft ferromagnetic layer of 1.1T forms saturation magnetic flux density Bs, lining is made up of Ni, Ni alloy, NiFe alloy or NiCo alloy.So, magnetic recording media and the magnetic recording and the transcriber that can write down and reproduce high density information and have the good production rate can be provided.
Description of drawings
Fig. 1 is a sectional view, has shown first example of the magnetic recording media relevant with the present invention;
Fig. 2 has shown the MH loop line of the component in the substrate surface of soft magnetism lining used in the magnetic recording media relevant with the present invention;
Fig. 3 is an arrangement plan, has shown the magnetic recording of the magnetic recording media that use is relevant with the present invention and an example of transcriber.
The explanation of reference number:
A: magnetic recording media; A: soft magnetism lining; 1: non-magnetic substrate; 2: the first soft ferromagnetic layers; 3: nonmagnetic intermediate layer; 4: the second soft ferromagnetic layers; 5: lining; 6: the middle layer; 7: perpendicular magnetic recording layer; 8: protective seam; 9: lubricating layer; 10: magnetic recording media; 12: magnetic recording and transcriber; 13: spindle motor; 14: magnetic head; 15: magnetic-head actuator; 16: record-reproducing signal disposal system.
Embodiment
Fig. 1 has shown first example of magnetic recording media of the present invention.
The nonmagnetic intermediate layer 3 and second soft ferromagnetic layer 4 that the magnetic recording media A here comprises first soft ferromagnetic layer 2, is made up of Ru; These layers have constituted the soft magnetism lining together on non-magnetic substrate 1, order forms lining 5, middle layer 6, perpendicular magnetic recording layer 7, protective seam 8 and lubricating layer 9 on this.
As non-magnetic substrate 1, can use the metallic substrates of processing by such as metal materials such as aluminum or aluminum alloy, also can use the non metallic substrate of processing by such as nonmetallic materials such as glass, pottery, silicon, silit or carbon.
Used substrate of glass can be amorphous glass and crystallized glass in this example.General soda-lime glass or sillico aluminate glass can be used as said amorphous glass.Lithium base crystallized glass can be used as said crystallized glass.
Through using the non-magnetic substrate 1 of average surface roughness Ra, the crystal orientation of middle layer and perpendicular magnetic recording layer is enhanced, thereby record and reproducing characteristic are enhanced less than 0.8nm (more preferably less than 0.5nm).In addition, the low-level flight that is suitable for the magnetic head of high record density medium is favourable characteristics.In addition, the low-level flight of the magnetic head that surface micro percent ripple (Wa) is adopted in writing down for high record density less than 0.3nm (preferably less than 0.25nm) is preferred, is favourable characteristics.
The soft magnetism lining comprises two soft ferromagnetic layers and formed Ru layer between these two soft ferromagnetic layers.On the said Ru layer with under soft ferromagnetic layer be AFC coupling.
Soft ferromagnetic layer 2,4 preferably is made up of the CoAl alloy, more preferably is made up of the CoFeAl alloy.Saturation magnetic flux density Bs should be greater than 1.1T, more preferably greater than 1.4T.Through using these materials, can obtain high saturation magnetic flux density and high corrosion resistivity.In addition, when Ni, Ni alloy, NiFe alloy or CoNi alloy are used in the lining 5, can obtain outstanding record and reproducing characteristic.
Through in soft ferromagnetic layer 2, adding Al, can improve record and reproducing characteristic and corrosion resistivity significantly.The amount of the Al that is added should be greater than 0.2at% less than 7at% (be preferably greater than 0.3at% and less than 5at%).If the amount of the Al that is added less than 0.2at%, so, can not stop the corrosion of Co or Fe fully, so this amount is not preferred.If the amount of Al surpasses 7at%, so, record and reproducing characteristic can be degenerated, and this amount also is not preferred.Preferably among CoAl in soft ferromagnetic layer 2,4 or the CoFeAl add a kind of incessantly among Ta, Nb or the Zr.Through adding these elements, can improve the decrystallized of soft ferromagnetic layer 2,4, and strengthen corrosion resistivity.Along with in soft ferromagnetic layer 4, adding these elements, can strengthen the crystal orientation characteristic in lining 5 and middle layer 6, be preferred so add these elements.
The amount that adds Ta, Zr, Nb is preferably greater than 5at% and less than 12at%.If the amount that adds these elements is less than 5at%, and if in soft ferromagnetic layer 2,4, use crystal structure, so, the crystal grain size of lining 5 can increase, and noise can increase, and corrosion resistivity can degenerate, so such quantity is not preferred.In addition, see that the total amount of the Al that is added, Ta, Nb preferably surpasses 15at% (being more preferably less than 12at%) from the angle of saturation magnetic flux density.
The adding of Ni and Cr is used for improving the corrosion resistivity of film, so the amount that is added is preferable over less than 5at%.Along with the increase of the amount that is added, corrosion resistivity can increase, but saturation magnetic flux density can descend, so this increase is not preferred.
Fe content in the soft ferromagnetic layer 2,4 preferably is lower than 50at% (more preferably greater than 10at% less than 40at%).If the content of Fe surpasses 50at%, corrosion resistivity can be degenerated so, so this content is not preferred.
The thickness of soft magnetism lining is preferably greater than 20nm and less than 80nm.If the thickness of soft magnetism lining is less than 20nm, so, just can not be write and to become insufficient, and record and reproducing characteristic can degenerate, so this thickness is not preferred by abundant absorption from the magnetic flux of magnetic head.If the thickness of soft magnetism lining surpasses 80nm, so, throughput rate can reduce widely, so this thickness is not preferred.
When CoFeAlZrNb, CoFeAlHfNb, CoFeAlTaNb, CoFeAlZrNbCr or CoFeAlZrNbNi are used as the material of soft ferromagnetic layer 2,4, can strengthen as the orientation characteristic of the lining 5 that predetermined material above that is set.In addition, the thickness in middle layer 6 can reduce, so the thickness of soft ferromagnetic layer 2,4 just can reduce.Therefore, can between record and reproducing characteristic and throughput rate, obtain good balance.
Particularly preferably be, soft ferromagnetic layer 2,4 adopts non crystalline structure.Through adopting non crystalline structure, can prevent that surface roughness Ra from increasing; Magnetic head flight height is reduced, in addition, can obtain high record density.If the use crystal structure can form the grain boundary part at intergranule so, this is the root of corrosion, so this structure is not preferred.
Index Hbias representes to constitute the AFC coupling amount of the soft ferromagnetic layer 2,4 of soft magnetism lining a, and it is preferable over greater than 50Oe.
With reference to figure 2 Hbias is described.Fig. 2 has shown the MH loop line (on the direction of the easy magnetizing axis of the soft ferromagnetic layer 2,4 that forms soft magnetism lining a) of the component in the substrate surface of soft magnetism lining a.If represent saturation magnetic flux density with Bs, so, Hbias just is defined as half the (that is magnetic field of, Bs/2) locating of saturation magnetic flux density Bs.Adopt above-mentioned material as soft ferromagnetic layer 2,4, get preset thickness (0.6 to 0.8nm), so, just can obtain soft magnetism lining a if be arranged on the thickness of soft ferromagnetic layer 2, the nonmagnetic intermediate layer between 43 (Ru).This makes external magnetic field resistance and WATE resistance strengthen.
The coercivity H of soft ferromagnetic layer 2,4 is preferably 10Oe or littler (more preferably less than 10Oe).Notice that 1Oe is about 79A/m.
For example can using, sputtering method forms the soft ferromagnetic layer 2,4 with above-mentioned configuration.When forming soft magnetism lining a, preferably form said film in the magnetic field that radially applies of substrate.Lining 5 is used for the orientation and the grain size of control setting perpendicular magnetic recording layer on it.Lining 5 preferably is made up of Ni, Ni alloy, NiFe alloy or NiCo alloy.
Can add some elements in Ni in above-mentioned lining 5, Ni alloy, NiFe alloy or the NiCo alloy, purpose is in order to reduce grain size and to increase the consistance of lattice size with respect to middle layer 6.Particularly in order to reduce grain size, can use B, Mn or the like, the amount that is added preferably is lower than 6at%.In order to increase the consistance of lattice size, can add Ru, Pt, W, Mo, Ta, Nb, Ti with respect to middle layer 6.
The saturation magnetic flux density Bs of the Ni in the lining 5, Ni alloy, NiFe alloy or NiCo alloy should be greater than 0.1T, more preferably greater than 0.3T.If less than 0.1T, so, during writing, the effect of a part of soft magnetism lining can weaken, and record and reproducing characteristic is degenerated, so be not preferred.
The thickness of lining 5 is preferably greater than 1nm and less than 10nm.If the thickness of lining 5 is less than 1nm, so, it is insufficient that the effect of lining just becomes, and can not play the effect that makes grain size become more tiny, and orientation meeting degeneration, so such value is not preferred.If the thickness of lining 5 surpasses 10nm, grain size can increase so, so such value also is not preferred.
Nonmagnetic intermediate layer 3 preferably is made up of Ru or Ru alloy.
The thickness of nonmagnetic intermediate layer 3 is preferably less than 16nm (more preferably less than 12nm).Through in soft ferromagnetic layer 2,4, using CoAl alloy or CoFeAl alloy and in lining 5, using predetermined material can realize this point.Through reducing the thickness of nonmagnetic intermediate layer 3, can reduce the distance between magnetic head and the soft magnetism lining a, and make magnetic flux become steeper from magnetic head.So, can further reduce the thickness of soft ferromagnetic layer 2,4, and increase throughput rate.
The easy magnetizing axis of perpendicular magnetic recording layer 7 is on the direction perpendicular to substrate surface.Element should comprise Co and Pt at least; In addition, can add oxide or Cr, B, Cu, Ta, Zr, so that improve the SNR characteristic.
Can use such as SiO
2, SiO, Cr
2O
3, CoO, Ta
2O
3And TiO
2Form perpendicular magnetic recording layer 7 Deng oxide.The percent by volume of oxide is preferably in 15% to 40% scope.If the percent by volume of oxide is lower than 15%, so, it is not enough that the SNR characteristic just becomes.This is not preferred.If the percent by volume of oxide surpasses 40%, just can not obtain the needed coercive force of high record density, so such value is not preferred.
The nucleation field of perpendicular magnetic recording layer 7 (Hn) is preferably greater than 2.0kOe.If-Hn less than 2.0kOe, so thermal fluctuation can take place, this is not preferred.
The thickness of perpendicular magnetic recording layer 7 preferably arrives in the scope of 20nm 6.If perpendicular magnetic recording layer 7 is granular oxide layers for example, and if the thickness of said granular oxide layer in this scope, can guarantee enough output so, and the degeneration of OW characteristic can not take place.So thickness is preferred in this scope.
Perpendicular magnetic recording layer 7 can be a single layer structure, also can be by the sandwich construction that material constituted with different component.Said structure optimization is a kind of like this structure, and this structure is to be got up by layer that contains oxide especially and the layer sequential cascade that does not conform to oxide.
In lubricating layer 9, can use conventional known material, such as PFPE, ethanol fluoride, carboxylic acid fluoride etc.
Magnetic recording media of the present invention preferably also comprises a restraining barrier between non-magnetic substrate and soft magnetism lining.
Selected in the element in the element that the preferred soft magnetism lining of the essential element that said restraining barrier had is comprised except that Co and Fe.So,, can control because the generation of the corrosion that water constituent caused of original or absorption through using this material as the restraining barrier.
Said restraining barrier preferably has non crystalline structure.When the restraining barrier was crystal structure, corrosion began to take place from granule boundary.Have the restraining barrier of non crystalline structure through use, can improve corrosion resistivity, because neither one partly has point of instability or different density.
Magnetic recording media A in this example is the perpendicular magnetic recording medium on non-magnetic substrate 1, comprises soft magnetism lining a, lining 5, middle layer 6 and perpendicular magnetic recording layer at least.Said soft magnetism lining a is the CoAl alloy, comprises soft ferromagnetic layer 2,4, and Bs is greater than 1.1T for its saturation magnetic flux density, and said lining can be made up of Ni, Ni alloy, NiFe alloy or CoNi alloy.Therefore, this magnetic recording medium mass-energy writes down high density information and reproduces, and has outstanding throughput rate.
Fig. 3 has shown the magnetic recording that uses above-mentioned magnetic recording media and the example of transcriber.Magnetic recording here and transcriber 12 comprise magnetic recording media 10, be used for driving rotationally the spindle motor 13 of said magnetic recording media 10, be used for magnetic head 14, magnetic-head actuator 15 and the record-reproducing signal disposal system 16 of on magnetic recording media 10 record and information reproduction.Record-reproducing signal disposal system 16 can be handled the input data and tracer signal is sent to magnetic head 14, and can handle reproducing signal and output data from magnetic head 14.
[example]
Here through describe advantage of the present invention with reference to example.Yet, should be understood that the present invention is not only limited in these examples.
(example 1)
With substrate of glass (amorphous substrate MEL3,2.5 inches of the diameters, (MYGCo. of MYG company limited; Ltd.) manufacturing) put into DC magnetic control sputtering system (model C 3010; The film of Anelva company limited (Anelva Co. Ltd.) makes) forms in the chamber, and the air that film is formed in the chamber is evacuated down to 1 * 10
-5Pa.
Form thickness and be 30nm by 70Co-20Fe-2Al-4Zr-4Nb (Co content 70at%; Fe content 20at%; Al content 2at%; Zr content 4at%, Nb content 4at%) first soft ferromagnetic layer, the thickness that is constituted is that the nonmagnetic intermediate layer 3 that is made up of Ru and the thickness of 0.6nm is second soft ferromagnetic layer 4 that is made up of 70Co-20Fe-2Al-4Zr-4Nb of 30nm, as soft magnetism lining a.Can confirm that through XRD the crystal structure of first and second soft ferromagnetic layers 2,4 is a non crystalline structure.
Then, lining 5 is that the Ni of 5nm constitutes by thickness, and middle layer 6 is that the Ru of 12nm constitutes by thickness, and perpendicular magnetic recording layer 7 is the 60Co-10Cr-20Pt-10SiO of 10nm by thickness
2And thickness is the 65Co-18Cr-14Pt-3B formation of 6nm.
Then, forming thickness through the CVD method is the protective seam 8 of 4nm.
Method through dipping forms the lubricating layer 9 that is made up of PFPE, so just obtained perpendicular magnetic recording medium A.
(reference examples 1,2)
Except using 91Co-5Zr-4Nb or the material of 71Co-20Fe-5Zr-4Nb, according to example 1 magnetic recording media in the reference examples 1,2 of purchasing as first soft ferromagnetic layer and second soft ferromagnetic layer.
The magnetostatic characteristic of the magnetic recording media in said example and the reference examples and record and reproducing characteristic are assessed.(Neoarc Co., the Kerr effect measurement equipment of Ltd.) making is estimated magnetostatic characteristic, uses the read-write analyser RWA1632 of U.S. GUZIK manufacturing and universal stage S1701MP to measure also estimated record and reproducing characteristic to use Neoarc company limited.
For estimated record and reproducing characteristic, use thin-film head (having TMR element and the single magnetic pole that is used to write in the record cell), adopt the linear recording density of 1000kFCI to come the survey record frequency status.(overwrite, OW) characteristic are measured the first remaining signal after writing the 500kFCI signal and writing the 67kFCI signal then in order to estimate to override.Carry out corrosion test, use optical microscope to observe several Stainings, these Stainings are to stay after following 240 hours at high temperature and high humility (80 ℃, 80%).The result of above-mentioned assessment is shown in table 1.
Example in the table 1 can compare with reference examples 1,2, and has confirmed that record and reproducing characteristic are extraordinary.Can see, even when the Ru of the less thickness of 12nm has been used in middle layer 6, also can obtain outstanding record and reproducing characteristic.When having used such as the lower material of Bs such as CoZrNb or CoTaZr, override (OW) performance degradation, this means that film thickness is not enough.
Also confirmed not observing Staining in the corrosion test that sample carried out in the example 1.Can reach a conclusion from above, record and reproducing characteristic have improved, and can improve corrosion resistivity widely through adding Al.
(example 2 to 10)
Except the component that changes soft ferromagnetic layer, prepare magnetic recording media according to example 1 generally.Table 2 has shown the result of assessment.
[0096]All samples for having different component in the example shown in the table 2 can obtain outstanding characteristic.
Sample in the example 2 shown in the table 2 has the Al of 0.3at%, and a spot of Staining is arranged in this sample.On the contrary, in the sample that contains Al 2at%, 3at% and 7at%, there is not Staining to occur.In addition, as viewed in the reference examples in table 12, in the sample that does not contain Al, can on very on a large scale, produce Staining.Therefore just confirmed,, can strengthen corrosion resistivity through in the CoFeZrNb system, adding Al.Yet, the sample in the example 3 of sample in the example 4 of the Al that has added 7at% and the Al that has added 3at% is compared, the SNR of record and reproducing characteristic begins to reduce, so, can reach a conclusion, the amount upper limit of the Al that is added preferably is taken as 7at%.
In addition, the relatively demonstration of example 1 and reference examples 1,2 in the table 1 through in CoFeZrNb base alloy, adding Fe, can improve saturation magnetic flux density.Yet, according to the example in the table 26, in the sample of the Fe that contains 50at% Staining has appearred.Can reach a conclusion according to top data, must add Fe improving the saturation magnetic flux density of this system, if but the content of Fe is too much, even added Al, also can begin to occur Staining.So even in having added the CoFeZrNb base alloy of Al, the content of Fe also preferably is lower than 50at%.
(example 11,12,13)
Except the thickness that changes the soft magnetism lining, prepare magnetic recording media according to example 1.Table 3 has shown the result of assessment.
Can see that from the result shown in the table 3 in the example of thickness greater than 20nm of soft magnetism lining, all samples has all obtained outstanding characteristic.Thickness at the soft magnetism lining is that the coercive force of sample reduces slightly in the example 13 of 15nm, and SNR also slightly reduces.
(routine 14-31)
Except the thickness and material that change lining, prepare magnetic recording media according to example 1.Table 4 has shown the result of assessment.
From the result of table 4, can confirm, when using Ni, Ni alloy, NiFe alloy or NiCo alloy in the lining of sample, can obtain outstanding especially characteristic.That is, coercive force is high, finds that also SNR characteristic and corrosion resistivity are fabulous.
(routine 32-41)
Except the material and thickness that change the middle layer, prepare magnetic recording media according to example 1.Table 5 has shown the result of assessment.
Result from table 5 can reach a conclusion, and is using CoFeAlZrNb, CoFeHfTaAl can obtain outstanding characteristic in as the sample of intermediate layer material.The all samples of the thickness in middle layer in 8 to 25nm scopes can obtain outstanding characteristic.That is, coercive force is high, finds that also SNR characteristic and corrosion resistivity are fabulous.
(example 42)
Except form between non-magnetic substrate and the soft magnetism lining thickness be the 60Nb-40Cr layer of 8nm with non crystalline structure as the restraining barrier, prepare magnetic recording media according to the method in the example 2.As magnetostatic characteristic, the coercive force of magnetic recording media is 4630Oe, and the SNR characteristic is 24.2dB, and Staining (each surface) is 0.
Industrial applicibility
As stated; According to the present invention; Perpendicular magnetic recording medium comprises soft magnetism lining, lining, middle layer and perpendicular magnetic recording layer at least on non-magnetic substrate; Wherein, be made up of the CoAl alloy greater than the soft magnetism lining that the soft ferromagnetic layer of 1.1T forms saturation magnetic flux density Bs, this lining is made up of Ni, Ni alloy, NiFe alloy or NiCo alloy.So, magnetic recording media and the magnetic recording and the transcriber that can write down and reproduce high density information and have the good production rate can be provided.
Claims (18)
1. perpendicular magnetic recording medium comprises:
Non-magnetic substrate; And
Soft magnetism lining, lining, middle layer and perpendicular magnetic recording layer on said non-magnetic substrate,
Wherein, said soft magnetism lining comprises the soft ferromagnetic layer that has non crystalline structure and be made up of greater than the CoAl alloy of 1.1T saturation magnetic flux density Bs.
2. magnetic recording media according to claim 1, wherein, said soft ferromagnetic layer is made up of greater than the CoFeAl alloy of 1.4T saturation magnetic flux density Bs.
3. magnetic recording media according to claim 1, wherein, the content of Al is greater than 0.2at% but less than 7at% in the said soft ferromagnetic layer.
4. magnetic recording media according to claim 3, wherein, the content of Al is greater than 0.3at% but less than 3at% in the said soft ferromagnetic layer.
5. magnetic recording media according to claim 2, wherein, the content of Fe is less than 50at% in the said soft ferromagnetic layer.
6. magnetic recording media according to claim 1 wherein, also comprises one of Ta, Nb and Zr at least in the composition in the said soft ferromagnetic layer.
7. magnetic recording media according to claim 1 wherein, also comprises Ni or Cr in the composition in the said soft ferromagnetic layer.
8. magnetic recording media according to claim 1, wherein, said soft magnetism lining comprises two-layer AFC (antiferromagnetic coupling) structure and the Ru film that between this two-layer soft ferromagnetic layer, forms.
9. magnetic recording media according to claim 1, wherein, said lining material is Ni, Ni alloy, NiFe alloy or NiCo alloy, the said middle layer that is provided with on it is the Ru alloy that has less than the Δ θ 50 of 6 degree.
10. magnetic recording media according to claim 1, wherein, said middle layer is made up of Ru or Ru alloy.
11. magnetic recording media according to claim 1, wherein, the thickness of said soft magnetism lining is greater than 20nm but less than 80nm.
12. magnetic recording media according to claim 1, wherein, the thickness in said middle layer is less than 16nm.
13. magnetic recording media according to claim 1, wherein, said soft ferromagnetic layer is CoFeAlZrNb, CoFeAlHfNb, CoFeAlTaNb, CoFeAlZrNbCr or CoFeAlZrNbNi.
14. magnetic recording media according to claim 1 also comprises the restraining barrier between said non-magnetic substrate and said soft magnetism lining.
15. magnetic recording media according to claim 14, wherein, the essential element that said restraining barrier comprised is selected from the group that the element except that Co and Fe that said soft magnetism lining comprised is formed,
The element that wherein said soft magnetism lining is comprised is Co, Fe, Al, Ni, Ta, Nb, Zr, Ni and Cr.
16. magnetic recording media according to claim 14, wherein, said restraining barrier has non crystalline structure.
17. magnetic recording media according to claim 14, wherein, the thickness on said restraining barrier is greater than 1nm but less than 20nm.
18. magnetic recording and transcriber; Comprise, magnetic recording media be used on said magnetic recording media the magnetic head of record and information reproduction, wherein; Said magnetic head is single magnetic pole magnetic head, and said magnetic recording media is according to any one the described magnetic recording media in the claim 1 to 17.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP372064/2005 | 2005-12-26 | ||
| JP2005372064A JP4101836B2 (en) | 2005-12-26 | 2005-12-26 | Magnetic recording medium, manufacturing method thereof, and magnetic recording / reproducing apparatus |
| PCT/JP2006/326305 WO2007074913A1 (en) | 2005-12-26 | 2006-12-22 | Magentic recording medium and magnetic recording and reproducing device |
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| Publication Number | Publication Date |
|---|---|
| CN101258542A CN101258542A (en) | 2008-09-03 |
| CN101258542B true CN101258542B (en) | 2012-01-25 |
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| CN2006800329347A Active CN101258542B (en) | 2005-12-26 | 2006-12-22 | Magnetic recording medium and magnetic recording and reproducing device |
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| Country | Link |
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| JP (1) | JP4101836B2 (en) |
| CN (1) | CN101258542B (en) |
| TW (1) | TWI351690B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4637785B2 (en) * | 2006-04-26 | 2011-02-23 | 昭和電工株式会社 | Magnetic recording medium and magnetic recording / reproducing apparatus |
| JP2008121071A (en) * | 2006-11-13 | 2008-05-29 | Sanyo Special Steel Co Ltd | SOFT MAGNETIC FeCo BASED TARGET MATERIAL |
| JP5605787B2 (en) * | 2008-07-14 | 2014-10-15 | 山陽特殊製鋼株式会社 | Sputtering target material for forming an alloy for a soft magnetic film layer in a perpendicular magnetic recording medium and its manufacturing method |
| JP5348661B2 (en) * | 2009-01-22 | 2013-11-20 | 山陽特殊製鋼株式会社 | Soft magnetic target material |
| US9064519B2 (en) | 2011-07-06 | 2015-06-23 | Hitachi Metals, Ltd. | Soft magnetic under layer |
| JP7371494B2 (en) * | 2019-12-27 | 2023-10-31 | 株式会社レゾナック | Magnetic recording media and magnetic storage devices |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6841259B1 (en) * | 2000-05-31 | 2005-01-11 | Migaku Takahashi | Magnetic thin film, production method therefor, evaluation method therefor and magnetic head using it, magnetic recording device and magnetic device |
| CN1707624A (en) * | 2004-05-13 | 2005-12-14 | 富士通株式会社 | Perpendicular magnetic recording medium, method of producing the same, and magnetic storage device |
-
2005
- 2005-12-26 JP JP2005372064A patent/JP4101836B2/en active Active
-
2006
- 2006-12-22 CN CN2006800329347A patent/CN101258542B/en active Active
- 2006-12-22 TW TW95148538A patent/TWI351690B/en not_active IP Right Cessation
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6841259B1 (en) * | 2000-05-31 | 2005-01-11 | Migaku Takahashi | Magnetic thin film, production method therefor, evaluation method therefor and magnetic head using it, magnetic recording device and magnetic device |
| CN1707624A (en) * | 2004-05-13 | 2005-12-14 | 富士通株式会社 | Perpendicular magnetic recording medium, method of producing the same, and magnetic storage device |
Non-Patent Citations (2)
| Title |
|---|
| JP特开2005-327430A 2005.11.24 |
| 说明书第7页第21行-第11页第17行，第23页第13行-第24页第13行，图1，12，13. |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2007172783A (en) | 2007-07-05 |
| TWI351690B (en) | 2011-11-01 |
| CN101258542A (en) | 2008-09-03 |
| TW200809805A (en) | 2008-02-16 |
| JP4101836B2 (en) | 2008-06-18 |
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