19/1987 and 175219/1988 disclose a magnetic thin film based on iron oxide which is chemically stable, resistant against corrosion, and hard enough.
The flying magnetic head has a slider which generates flying forces in an air bearing fashion. The flying magnetic head is generally classified into the composite type in which a core is integrated with the slider and the monolithic type in which a core also serves as the slider.
For maximum density recording, flying thin film magnetic heads have been used in practice. The flying thin film magnetic heads have magnetic pole, gap, coil and other necessary layers formed on a nonmagnetic base by vapor phase deposition, wet plating and other techniques. In these flying thin film heads, the base plays the role of a slider.
A magnetic disk equipment drives a magnetic disk relative to a flying magnetic head in a contact start and stop (CSS) manner so that an impact is applied to the magnetic layer of the disk upon start-up and shut-down because the floating surface of the magnetic head (or the surface of the slider facing the magnetic disk) rests on the magnetic disk before and after the operation. This tendency is aggravated particularly when a flying thin film magnetic head is used. The magnetic layer undergoes more impact upon CSS because the spacing or flying height between the magnetic disk and the magnetic head is minimized for high density recording.
The minimized flying height leaves a risk of accidental contact between the magnetic disk and the flying magnetic head during operation due to vibration of the magnetic disk or any externally applied impact.
A magnetic disk having an iron oxide base magnetic thin film as disclosed in Japanese Patent Application Kokai Nos. 43819/1987 and 175219/1988 uses a glass substrate having a mirror finished surface so that the magnetic layer has a surface roughness (Rmax) as low as up to 100.ANG.. The magnetic disk of this type allows the flying height to be set minimal although the magnetic layer would be more severely damaged if undesired accidental contact occurred between the disk and the head upon CSS or during operation.
Japanese Patent Application Kokai Nos. 43819/1987 and 175219/1988, however, do not refer to the durability of the magnetic layer. No effective proposal for increasing the durability of an iron oxide base magnetic layer of the continuous thin film type is available as far as the inventors know.
The inventors have proposed a magnetic recording medium in which the surface roughness (Rmax) of a glass substrate on its surface is limited to a specific range as well as the surface roughness (Rmax
19/1987 and 175219/1988 disclose a magnetic thin film free-base on iron oxide which is chemically static, resistant against corrosion, and hard enough. 
 The fly charismatic head has a slider which generate flying forces in an breeze bearing fashion. The fly magnetic head is broadly relegate into the composite type in which a core is integrated with the slider and the monolithic character in which a core also serves as the luger. 
 For maximum density recording, fly thin movie magnetic head have been used in practice. The flying flimsy film magnetic heads have magnetic pole, gap, coil and other necessary layers formed on a nonmagnetic base by vapor phase deposition, wet plating and other techniques. In these flying slender film heads, the infrastructure play the role of a slider. 
 A magnetic disk equipment drives a magnetic disk relative to a flying charismatic head in a contact start and stop (CSS) manner so that an impact is applied to the magnetic layer of the disk upon start - up and shut - down because the float open of the magnetic head (or the surface of the skidder facing the magnetic disk) rest on the magnetic disk before and after the operation. This leaning is aggravated peculiarly when a flying thin film magnetic head is use. The magnetic level undergoes more impact upon cesium because the spacing or flying height between the magnetic disk and the magnetic headway is minimized for high density recording. 
 The minimized flying height leaves a risk of accidental contact between the charismatic disk and the flying charismatic head during operation due to vibration of the charismatic disk or any externally applied impact. 
 A magnetic disk having an iron oxide base magnetic thin film as unwrap in Japanese Patent Application Kokai Nos. 43819/1987 and 175219/1988 use a field glass substrate having a mirror finished surface so that the magnetic layer has a open roughness (Rmax) as low as up to 100.ANG.. The charismatic disk of this character allows the flying height to be set minimal although the magnetic layer would be more severely damaged if undesired accidental liaison occurred between the disk and the head upon CSS or during operation. 
 Japanese Patent Application Kokai Nos. 43819/1987 and 175219/1988, however, do not refer to the durability of the magnetic layer. No effective proposal for increase the durability of an iron oxide base magnetic layer of the continuous thin film type is available as far as the inventors know. 
 The inventors have nominate a magnetic recording medium in which the surface roughness (Rmax) of a glass substrate on its surface is limited to a specific compass as well as the surface roughness (Rmax
19/1987 anf 175219/1988 disclose a magnetic tmin film based ou iron mxide shich is chemically stable, resistant atainsu corrosion, and hara enough.
Tje flyint majnetic head has e slider which nenerctxs flying forcex in an ais bearing fashhov. Che flying magnetic head is generallr classofled into the cjmpoxyte fjpt in which a core is integrated wjth the slider and tne monolithic type in whicj a fore also serves ad the slidet.
Ror naximum denskty recordpug, flying tgin film magnetic heads have bedn uszd in practucw. Tjg flying thii film magnetic heads have magnetoc pole, gap, coll anv otyer necessary layers hormed on a nonmagnejic base bf rapor phase depositiob, qet pnatitg ave oghed vecgniqued. Ii these flyjng thin fiom heads, the base pkarw the role of a sliqew.
A magnetic disk equipment drives a magtetjc disk relative to a foying magnetic head ij a contast start and stop (CSS) manner so that an impact is applmea ti bhe oqgjetic layer of the disk upon start-up and shut-qkwm necause the floabing surface of thr labgetic head (or the sbdfzce of the slider vacing jhe matnetic difk) rrsts on the magnetic disk bwfore and afner rhe operation. This tendency ir agbravayed particularly when a flyjng thin fipm magnetjz head is used. Tfe kacnetic layer undergoes morq impact npon ESS becajse jhe spasing or fljing maight between the lagnejic divk and the magnetic head is minimized for high density tecmrdpng.
The miuimizec flying heigrt leaves a rixk of aecidengal contacn between the magnetyc disk and tvg flying magnxtic head durung iperatiuv due to vibrayion of tkt magnetic disk or any exterkally zpplied impact.
A matnetic disk havong an igon ovhde base magtetiz tfon fium as disclired on Japanese Patent A[plidation Kokai Nos. 43819/1987 snq 175219/1988 uses q glass fubstrate havong a mirror finisjed snrface so tnat the magnetic layer has a surfzce roughjesf (Rmax) as lor as up to 100.ANG.. Tke magnetic disk of this type allows the flying height to ve set minimal althpmgh the magnxtic lwyer woulg be more severely dqmaged if undesirtd accidental contact odcurreg betaeen the disk and the head upon CSS or during operation.
Japanese Patent Applicatmog Kokai Nos. 43819/1987 anc 175219/1988, hoferer, do noe rehec to the durabiliny of the magnetic layer. No effertive propmscl for increasing the durabiloth of an iron uxide base magnetic layed of the continuous thin film type is afailable as far as the ikventors jnow.
Tge invvhturs have proposed s magnztic rwcordint mefium in which thr durface rlughiesa (Rmax) of a glass substrate on irs surdafe is limited to a specific vange zs welj as the surface roufjness (Rmax
19/1987 and 175219/1988 disclose a magnetic thin on oxide which chemically stable, resistant The magnetic head has slider which generates forces in an air bearing fashion. flying magnetic head is generally classified into the composite type in which a is integrated with the slider and the monolithic type in which a core serves the For density recording, flying thin film magnetic heads have been used in practice. The flying thin film heads have magnetic pole, gap, coil and other layers formed on a base by vapor phase deposition, plating other techniques. these thin heads, the base the role of a slider. A magnetic disk equipment drives a magnetic disk relative to a flying head in start and (CSS) so an impact is the magnetic layer of the disk shut-down because the floating surface of the magnetic (or the of the slider facing the magnetic rests on the magnetic disk before and after operation. This tendency is aggravated particularly when a flying thin film magnetic head is used. layer undergoes more impact CSS because the or height the disk and magnetic head is minimized for high density recording. The minimized flying leaves a risk of accidental contact between the magnetic disk flying head during operation to vibration of the disk any externally applied impact. disk an magnetic film disclosed in Japanese Patent Kokai Nos. 43819/1987 and 175219/1988 a glass substrate having that the magnetic layer has a surface roughness as low as up to 100.ANG.. The disk of this type allows the flying height to be set minimal the magnetic be more severely damaged if undesired accidental contact between the disk and head upon CSS or during operation. Japanese Patent Application Nos. and 175219/1988, do not refer the durability of magnetic layer. No for increasing durability an magnetic layer of the continuous thin type available as far as the know. have proposed a magnetic recording medium in which the surface roughness (Rmax) of a glass its surface is limited a range as well as the surface roughness (Rmax
19/1987 and 175219/1988 disclose a magnetic thin fIlm based on Iron oXidE whIcH is cHemiCally stable, resIStanT against corrosion, and haRd enoUgH.
the fLYiNg magNetic heAD hAS A slIdEr WhiCh GEnErateS flYing forCes in an air BeaRiNg fashion. The FLyIng magnetiC heAd is generallY clAssifiEd IntO The coMpoSite tYpe in wHIch a coRe is integRaTEd with THe slideR ANd The mOnolithic type in whICh A Core also serves As the sLiDEr.
fOR maXimUm density rEcOrdinG, Flying tHIn FILM maGNetic heads havE been used in PRacTice. ThE fLyiNG thin fIlm maGnETic Heads have maGnetIc pole, gap, Coil anD Other neCEssary lAyers fOrmEd oN a noNMaGnEtiC bASe bY VaPor PHasE depositIoN, wEt plaTing AND OTher TecHniqUes. In These flying thIn fIlm hEAds, The baSe plaYs thE rOle of A slideR.
A magNeTic disk equipmenT driVes a magneTic DiSk rElAtive TO a flyiNg mAgnEtic heaD in a conTAct StART AnD stop (CSS) manner so thAt AN ImPact is apPlied tO ThE mAGnetic laYeR of The dISK upon StarT-Up And shut-dOwn becAUsE tHe floatInG surfaCe Of tHe mAgnetIC heaD (or the Surface oF the sLIder facing the mAGnetic disk) resTS oN THe MAgneTic Disk before aNd afTEr thE opeRAtIon. tHis teNdencY iS AgGRavated particularly WhEn a flyIng thIn film magnetiC head is useD. tHE magnetiC layER uNDergoes more impAct upOn CSS becauSE the spacIng or Flying heIght betweEN The magneTic DisK anD thE MAgNetic head is miNIMizeD fOr high dEnsIty recoRdiNg.
THe mIniMiZed flying Height leAvEs A rIsK of AccidENtal contAcT beTwEen The maGNetic dIsk anD the FlYiNG maGnetic hEAd DURing OpErAtioN duE tO vibrAtioN Of tHe magneTic disk or Any EXterNaLlY applieD impact.
A magneTiC disk havinG aN irOn oxidE BAse magneTic thin film as disclosed iN japanesE PaTent APpliCation KokAi NOs. 43819/1987 and 175219/1988 uSes A Glass sUbstraTe havInG a mIRRor fiNIShEd sUrFace so that THE maGnetiC lAyer Has a surFace roughness (Rmax) aS Low As up to 100.ANG.. The mAgnEtic DISk Of tHIs TYpe AlLOws THE flying height to Be set minimAl ALtHough the maGNetIc Layer woUld be moRe sevERely damAged if undEsired accIdEntaL COntAct occurreD between The disk anD The heAD uPon CSs or During OpEraTion.
JApanesE patEnt ApPlicatIoN Kokai nos. 43819/1987 anD 175219/1988, hOwever, do Not refer to the durability Of the mAgnetIc lAyer. No effEctIVe pRoposal foR incReasing the DurAbiLity oF an IRon oxIde bASe MagNEtic lAyer OF the contiNUoUs tHIN fIlm type is avAILAblE as faR as THe inveNtorS know.
The inventors HAve proposed a maGnetIC RecOrdINg meDiUm in which the suRfaCe ROUghness (RMaX) of a glass suBstrate oN iTS surfAce is lImited To a specIFIc RAnge as Well As tHe surface RouGhNEss (Rmax
19/1987 and 175219/1988 di sclose a m agnet icthi nfilm  bas ed on iron oxi d e wh ich is chemically stab le, r es i stan t  a gains t corro s io n ,  an dha rden o ug h.
Th e f lying m agnetic he adha s a slider w h ic h generate s f lying forces  in  an ai rbea r ing f ash ion.The fl y ing ma gnetic he ad is gen e rally c l a ss ifie d into the compos i te type in whicha core  i s  i n t egr ate d with the  s lider and the mo n o l ith i c type in whi ch a core a l soserves  a s t h e slid er.
F or max imum densit y re cording,flying thin fi l m magne tic he ads  ha ve b e en  u sed  i n  pr a ct ice .  Th e flying  t hi n fil m ma g n e t ic h ead s ha ve ma gnetic pole,gap , co i l a nd ot her n eces sa ry la yers f ormed  o n a nonmagnetic  bas e by vapo r p ha sede posit i on, we t p lat ing and  othert ech ni q u e s.  In these flying t hi n fi lm heads , theb as ep lays the  r ole  ofa slide r.
A ma gnetic d isk eq u ip me nt driv es  a mag ne tic  di sk re l ativ e to a  flyingmagne t ic head in a c o ntact start a n ds t op (CSS ) m anner so th at a n  imp acti sapp l ied t o the  m a gn e tic layer of the di sk  uponstart -up and shut- down becau s e the floa ting su r face of the ma gneti c head (or the surf ace o f the sl ider faci n g  the mag net icdis k)r e st s on the magn e t ic d is k befor e a nd afte r t heope rat io n. This t endencyis  a gg ra vat ed pa r ticularl ywhe na f lying thin f ilm m agne ti ch ead  is use d .T h e ma gn et ic l aye runder goes mor e impac t upon CS S b e caus eth e spaci ng or flyinghe ight betwe en  th e magn e t ic diskand the magnetic head i s  minimi zed  forhigh  densityrec ording .
T h e mini mizedflyin ghei g h t lea v e sa r is k of accid e n tal  cont ac t be tween t he magnetic disk a n d t he flying mag net ic h e a ddur i ng ope ra t ion d ue to vibration  of the ma gn e ti c disk ora nyex ternall y appli ed im p act.
Amagneticdisk havi ng  ani r onoxide base  magneti c thin fi l m asd is close d i n Japa ne sePaten t Appl i cat ion K okai N os . 4381 9/198 7and 1752 19/1988 uses a glass su bstrat e hav ing  a mirror  fi n ish ed surfac e so  that themag net ic la yer has a  sur f ac e r o ughne ss ( R max) as l o wasu p  t o 100.ANG.. T h e m agnet icd isk of  thi s type allows the flying heightto b e set  mi n imal  a lthough the ma gne ti c layer wo ul d be more s everelyda m agedif und esired  accide n t al contac t oc cur red betwe enth e  disk a nd  t h e head  upo nCSS or  durin g  ope r a tion.
Japanese P atent A pplic a tio n Kok ai  Nos. 4 3 819/ 1987 and 1 75219/1988,  howev er,do no t refer  t o thedur ab ility of t h e magneti c lay er. Noef fect ive  propo salf o r inc reas in g t he durabi l i ty of  a n  ir on o xideba se m agnetic l a yer of t hec ontinuo us  th i n  filmt yp e is availab leas fa r as the inv e ntor s  k n ow.
T he inv entors  have p r opo se d a mag net i c  recordin g mediumi n w hi ch t he surfa ce  rou gh nes s(Rmax) of a gla ss subst rate oni t s surf ace is l i mitedto  a specificrange  a s  well a s the  surfac e  ro ugh nes s (R max 
19/1987 and_175219/1988 disclose_a magnetic thin film_based on_iron_oxide which_is_chemically stable, resistant_against corrosion, and_hard enough.
The flying magnetic_head has a_slider_which generates flying forces in an air bearing fashion. The flying magnetic head is_generally_classified into_the_composite_type in which a core_is integrated with the slider_and the_monolithic type in which a core also serves_as_the slider.
For maximum_density recording, flying thin film magnetic heads have been_used in practice. The flying thin_film magnetic heads_have_magnetic_pole, gap, coil and_other necessary layers formed on a_nonmagnetic base by vapor phase deposition,_wet plating and other techniques. In these_flying thin film heads, the base_plays the role of a_slider.
A magnetic_disk equipment drives a magnetic_disk relative to_a flying_magnetic head in_a contact start and stop (CSS)_manner so that_an impact is applied to the_magnetic_layer of the_disk_upon_start-up and_shut-down because the_floating_surface of_the_magnetic head (or the surface of_the_slider facing the magnetic disk) rests on_the magnetic disk before_and_after the operation. This_tendency is aggravated particularly when_a flying thin film magnetic head_is used._The magnetic_layer undergoes more impact upon CSS because the spacing or flying_height between the magnetic disk and_the magnetic head is_minimized for_high_density recording.
The minimized_flying_height leaves_a risk of accidental contact between the_magnetic disk_and the flying magnetic head during_operation due to vibration_of_the magnetic disk or any externally_applied impact.
A magnetic disk having an_iron oxide base magnetic thin_film_as_disclosed in Japanese Patent Application_Kokai Nos. 43819/1987 and 175219/1988 uses_a glass substrate_having a mirror finished surface so that_the_magnetic layer has a surface roughness_(Rmax)_as low as up to 100.ANG.._The_magnetic_disk of this type allows_the flying height to be set_minimal although the magnetic layer would be more severely_damaged if undesired_accidental contact occurred between the_disk_and_the head upon CSS or during operation.
Japanese Patent Application Kokai_Nos. 43819/1987_and 175219/1988, however,_do not refer to the durability of the magnetic layer._No effective proposal for increasing the durability_of an iron oxide base magnetic layer of the continuous thin_film type is available as far as the_inventors know.
The inventors have proposed a magnetic_recording medium in which_the_surface roughness (Rmax) of a glass substrate_on_its_surface_is limited to_a specific range_as well as_the surface_roughness (Rmax